Trickier version of popular -Snail and wall- interview puzzle
video description
Second issue is that the second version changes the genre of the puzzle without telling you (from an abstract logic puzzle to what is arguably a _situation_ puzzle. And the third issue: Even if one is told that they have to think about the problem in terms of physics, if you don't specify the parameters, they could come up with any answer and justify it with physics. After all, it's been a long time since the snail ate, so maybe he's going to move slower as time goes on. Maybe it started raining. Maybe we should think about moisture and air pressure. Or maybe the snail was smarter than most and decided to simply detach itself and fall the 10m in a few seconds. Without specifying the parameters in advance, these considerations are no less valid (or rather, no more invalid) than the consideration of gravity.
Date: 2023-11-15
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Comments and reviews: 23
Kippe
This Riddle is wrong in about every imaginable way.
It takes the exact same time it took to get up, because it is irrelevant if up or down since you didnt clarify that the snail slides down due to gravity. If the snail uses the same pattern to climb down,
its gonna slide upwards while resting. Or it wants to climb down but uses the same pattern which only leads to climbing up, so its stuck on the top.
Or we use -common sense- to fill in what you did not clarify (which btw is most of the time the trap that people fall for, even if they would manage to solve a logic puzzle, but they cant because its not bound to logic) then we could say the answer you mentioned as wrong -trap- as the right one.
Simply because you cant just add gravity like that, it would at least keep accelerating the snail.
So basically you could choose the right answer as you like because there is no right or wrong way to solve this without knowing the exact parameters of this world, and if you want to use Logic according to the real world, you have to apply alot of different factors, ALLof them! Otherwhise if you choose a fantasy world, you have to clarify how what works in what way relating to this riddle.
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This Riddle is wrong in about every imaginable way.
It takes the exact same time it took to get up, because it is irrelevant if up or down since you didnt clarify that the snail slides down due to gravity. If the snail uses the same pattern to climb down,
its gonna slide upwards while resting. Or it wants to climb down but uses the same pattern which only leads to climbing up, so its stuck on the top.
Or we use -common sense- to fill in what you did not clarify (which btw is most of the time the trap that people fall for, even if they would manage to solve a logic puzzle, but they cant because its not bound to logic) then we could say the answer you mentioned as wrong -trap- as the right one.
Simply because you cant just add gravity like that, it would at least keep accelerating the snail.
So basically you could choose the right answer as you like because there is no right or wrong way to solve this without knowing the exact parameters of this world, and if you want to use Logic according to the real world, you have to apply alot of different factors, ALLof them! Otherwhise if you choose a fantasy world, you have to clarify how what works in what way relating to this riddle.
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Christian
In my opinion the solution of second part of puzzle n. 1 is not compatible or consistent with the one of the first part. In order to create a trap for the interviewer I think the questioner falls into a nonsense. In the first part the snail climbs up for 2m in one hour, then slides down for 1m in one hour and so on till he reaches the top (10 m. Solution is 17 hours, so this means that while climbing up the snail is not decelerated by gravity, otherwise we should reduce its speed of 1 m per hour, that-s what happen when it sleeps. And the result would be that the snail never mooves (1 m up, 1 m down, 1 m up. So if the snail moves up and its speed is 2 m per hour, and we all agree that he gets the top in 17 hours, it is not possible that in the second part its speed is affected by gravity on the way back. Or gravity acts in the two cases or never. So we have to simply consider the snail is climbing down at 2 m per hour, with no effect of gravity, and 6, 5 hours turns to be the most logical answer.
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In my opinion the solution of second part of puzzle n. 1 is not compatible or consistent with the one of the first part. In order to create a trap for the interviewer I think the questioner falls into a nonsense. In the first part the snail climbs up for 2m in one hour, then slides down for 1m in one hour and so on till he reaches the top (10 m. Solution is 17 hours, so this means that while climbing up the snail is not decelerated by gravity, otherwise we should reduce its speed of 1 m per hour, that-s what happen when it sleeps. And the result would be that the snail never mooves (1 m up, 1 m down, 1 m up. So if the snail moves up and its speed is 2 m per hour, and we all agree that he gets the top in 17 hours, it is not possible that in the second part its speed is affected by gravity on the way back. Or gravity acts in the two cases or never. So we have to simply consider the snail is climbing down at 2 m per hour, with no effect of gravity, and 6, 5 hours turns to be the most logical answer.
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Ken
Disagree! The problem says the snail climbs 2m in one hour. The implication is that it moves in any dircetion at the speed of 2m/nour. It does NOT say that gravity affects its motion while climbing.
If gravity affects his speed, he will accelerate downward while sleeping But he will not accelerate downward while climbing up--the effect of gravity will be a constant drag as he climbs. Furthermore, when he stops -climbing- downward, he will not stop. He will continue to slide at the same speed he was climbing down without as much acceleration in tha downward direction. So each resting period he will slide farther, as he gains more and more speed going down. The effect of gravity, if we need to take it into account, is far more complex than indicated here. Calculas is probably needed to get the correct answer.
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Disagree! The problem says the snail climbs 2m in one hour. The implication is that it moves in any dircetion at the speed of 2m/nour. It does NOT say that gravity affects its motion while climbing.
If gravity affects his speed, he will accelerate downward while sleeping But he will not accelerate downward while climbing up--the effect of gravity will be a constant drag as he climbs. Furthermore, when he stops -climbing- downward, he will not stop. He will continue to slide at the same speed he was climbing down without as much acceleration in tha downward direction. So each resting period he will slide farther, as he gains more and more speed going down. The effect of gravity, if we need to take it into account, is far more complex than indicated here. Calculas is probably needed to get the correct answer.
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Demonius
6. 5 hr is also correct answer. Let me explain. -
At 2: 26 you-observe- the snail and say that is slide down due to gravity. Ok. Then you MAKE AN ASSUMPTION that while snail moving it also slides down. In this case answer will be 4 hr. -
BUT. The statement of the problem does not indicate whether the snail slides down when moving or not. -
So, you may also LEGITIMATE ASSUME that while moving snail has constant speed 2 m/hr in any direction (due to 100% friction) and slides down only during rest (it just chillin'. Then answer will be 6. 5 hr. -
It's not a trick or trap, it's just a problem with incomplete conditions when answer depends on YOUR ASSUMPTION. Think wider.
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6. 5 hr is also correct answer. Let me explain. -
At 2: 26 you-observe- the snail and say that is slide down due to gravity. Ok. Then you MAKE AN ASSUMPTION that while snail moving it also slides down. In this case answer will be 4 hr. -
BUT. The statement of the problem does not indicate whether the snail slides down when moving or not. -
So, you may also LEGITIMATE ASSUME that while moving snail has constant speed 2 m/hr in any direction (due to 100% friction) and slides down only during rest (it just chillin'. Then answer will be 6. 5 hr. -
It's not a trick or trap, it's just a problem with incomplete conditions when answer depends on YOUR ASSUMPTION. Think wider.
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Michael
Great twist to the puzzle, but the whole story/explanation raises a lot of eyebrows, as you can see on the comments.
It would be better to use a different case, for example a boat moving full-power upstream with a velocity of 20km/h but has to shut down its overheated machine every hour for 1 h, where it slides back 10km. How long does it take for the boat to reach its destination which is 100km away?
And then the trick question: How long does it take for the same boat to go back home on the same path, travelling at the same full power?
This would make a lot more sense.
Snail speeding up due to gravity. kinda far-fetched for me -_--
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Great twist to the puzzle, but the whole story/explanation raises a lot of eyebrows, as you can see on the comments.
It would be better to use a different case, for example a boat moving full-power upstream with a velocity of 20km/h but has to shut down its overheated machine every hour for 1 h, where it slides back 10km. How long does it take for the boat to reach its destination which is 100km away?
And then the trick question: How long does it take for the same boat to go back home on the same path, travelling at the same full power?
This would make a lot more sense.
Snail speeding up due to gravity. kinda far-fetched for me -_--
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Daren
Buoyancy and density dipshit
Buoyancy and density are the laws that dictate what does what in another median.
I. e. air
there is absolutely no other Force added in any direction ever, therefore, gravity is only something kids believe in
Not critical thinkers
Or even logical thinkers
Buoyancy density temperature pressure light, static, magnetism, all these things exist, but not gravity, there is no added force in any direction that could be considered gravity
Duh
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Buoyancy and density dipshit
Buoyancy and density are the laws that dictate what does what in another median.
I. e. air
there is absolutely no other Force added in any direction ever, therefore, gravity is only something kids believe in
Not critical thinkers
Or even logical thinkers
Buoyancy density temperature pressure light, static, magnetism, all these things exist, but not gravity, there is no added force in any direction that could be considered gravity
Duh
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mikael
Faulty logic. You are assuming that when the snail is crawling that the mechanisms it's using to crawl will slide as it does when it's not not crawling. Possibly the act of crawling provides better grip than being stationary. We don't even know by what mechanism the snail crawls. Possibly the adhesion of the snail is weaker when stationary. I wasted time on this faulty riddle. Your riddles/problems are usually better than this.
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Faulty logic. You are assuming that when the snail is crawling that the mechanisms it's using to crawl will slide as it does when it's not not crawling. Possibly the act of crawling provides better grip than being stationary. We don't even know by what mechanism the snail crawls. Possibly the adhesion of the snail is weaker when stationary. I wasted time on this faulty riddle. Your riddles/problems are usually better than this.
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SUDEEP
disagree:
1. this rule can apply on river and boat but not here
2. if he slide down 1m in 1hour then in next 2 hour it may slide down more than 2m. bcz it is not defined any force like frictions force. if speed start at zero and end with x in 1 hour due to sliding. then next 1 hour it start with x and may end with x or x+k it depend upon friction force.
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disagree:
1. this rule can apply on river and boat but not here
2. if he slide down 1m in 1hour then in next 2 hour it may slide down more than 2m. bcz it is not defined any force like frictions force. if speed start at zero and end with x in 1 hour due to sliding. then next 1 hour it start with x and may end with x or x+k it depend upon friction force.
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cassandraoftroy
I kind of disagree. When one climbs downward, one is actually fighting against gravity in order to make a controlled descent; otherwise, snail slime or no, the answer would be -just over one second, with a distinct -splat- at the end. - So I'm not convinced that the snail should get to add gravity to its active climbing speed.
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I kind of disagree. When one climbs downward, one is actually fighting against gravity in order to make a controlled descent; otherwise, snail slime or no, the answer would be -just over one second, with a distinct -splat- at the end. - So I'm not convinced that the snail should get to add gravity to its active climbing speed.
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T. K.
I completely disagree. If the stated speed is 2 meters per hour, that must already include the effect of gravity. The given upward speed of the snail wasn-t adjusted for the effect of gravity, so the downward speed should not have to be adjusted either. Otherwise the logic to answer the two puzzles is different.
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I completely disagree. If the stated speed is 2 meters per hour, that must already include the effect of gravity. The given upward speed of the snail wasn-t adjusted for the effect of gravity, so the downward speed should not have to be adjusted either. Otherwise the logic to answer the two puzzles is different.
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muhammad
Great video however I am not convinced at all
Following common sense why would the snail rest in the way down?
Obviously it is having a hard time climbing up so it rests for 1 hour but when going down is shouldn't need to rest at least not for the same amount of time when it was climbing
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Great video however I am not convinced at all
Following common sense why would the snail rest in the way down?
Obviously it is having a hard time climbing up so it rests for 1 hour but when going down is shouldn't need to rest at least not for the same amount of time when it was climbing
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Long
This is a dumb answer and actually incorrect. Gravity is an acceleration force. Thus, for the snail to always slide 1m/hr while resting means it has some kind of braking force. Which throws out the whole premise of the solution. I usu love ur logic puzzles but this one is not worth the time.
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This is a dumb answer and actually incorrect. Gravity is an acceleration force. Thus, for the snail to always slide 1m/hr while resting means it has some kind of braking force. Which throws out the whole premise of the solution. I usu love ur logic puzzles but this one is not worth the time.
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Sagar
This one is not fare. At least the statement: -exact opposite happens while climbing down- is not valid here. exact opposite means the snail adjusts itself to match the downward speed also 2inch/hr
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This one is not fare. At least the statement: -exact opposite happens while climbing down- is not valid here. exact opposite means the snail adjusts itself to match the downward speed also 2inch/hr
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Mackem1985
That-s not how gravity works. It wouldn-t add a speed component, but one of acceleration. So it would be constantly accelerating downwards and would take far less time to reach the bottom.
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That-s not how gravity works. It wouldn-t add a speed component, but one of acceleration. So it would be constantly accelerating downwards and would take far less time to reach the bottom.
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Prakhar
Well it is obviously correct, but the method to solve these, is to use only the information which are given to us, cuz then in every question, many possibilities and forces can be possible
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Well it is obviously correct, but the method to solve these, is to use only the information which are given to us, cuz then in every question, many possibilities and forces can be possible
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Hement
You are trapped amar, while snail moving, moving at constant speed. That is its natural speed. You over think it. This time you are wrong. 2m in an hour means 2m in an hour not 3
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You are trapped amar, while snail moving, moving at constant speed. That is its natural speed. You over think it. This time you are wrong. 2m in an hour means 2m in an hour not 3
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Dougal
Snail climbing down speed is not specified, your assumption is simplistic.
It's entirely possible that the snail has a maximum speed, limited by how much slime it can make.
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Snail climbing down speed is not specified, your assumption is simplistic.
It's entirely possible that the snail has a maximum speed, limited by how much slime it can make.
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Dey
Well. snail sleeps bcoz it gets tired going upwards. While going downwards, the snail won't sleep as it won't get tired. So it will reach the ground in 10/4=2. 5 hrs.
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Well. snail sleeps bcoz it gets tired going upwards. While going downwards, the snail won't sleep as it won't get tired. So it will reach the ground in 10/4=2. 5 hrs.
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Gautam
The second explanation was a bit bizzare because gravity is a force and force will accelerate you downwards rather than providing with a constant velocity.
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The second explanation was a bit bizzare because gravity is a force and force will accelerate you downwards rather than providing with a constant velocity.
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Paul
I thought 10 hours! Going downwards it's harder to keep traction than going upwards, so until further notice 1m/h is the fastest downward speed.
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I thought 10 hours! Going downwards it's harder to keep traction than going upwards, so until further notice 1m/h is the fastest downward speed.
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Manshul
For all those thinking this explanation to be wrong, must rethink because it is correct solution and admire the beauty of this concept.
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For all those thinking this explanation to be wrong, must rethink because it is correct solution and admire the beauty of this concept.
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Yash
6. 5 is the correct answer according to given conditions. And there is no limit to assumptions if one wants to make any.
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6. 5 is the correct answer according to given conditions. And there is no limit to assumptions if one wants to make any.
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Ashish
Don-t agree, its not a free falling object, how can simple gravity rules apply? How about the force and friction?
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Don-t agree, its not a free falling object, how can simple gravity rules apply? How about the force and friction?
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