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zakruti.com » Knowledge, science, education » TED-Ed
Can you solve the jail break riddle? - Dan Finkel

Can you solve the jail break riddle? - Dan Finkel

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Rating: 4.0; Vote: 1
Your timing made you and your partner infamous bank robbers. Now, you need to use that timing to break out of jail. Your partner is about to flash you a signal, and exactly 45 seconds later the electric fence circuit will short out. Then you notice that your watch is broken, and all you have are two 1-minute fuses in your pocket. Can you time your escape and get free? Dan Finkel shows how. Lesson by Dan Finkel, directed by Artrake Studio
Date: 2020-08-22

Comments and reviews: 9


Light both ends of fuse 1 and one end of fuse 2 when you get the signal. Once fuse 1 had burned up, 30sec have passed since it burned twice as fast. When fuse 1 has burned, light the other end of fuse 2. Fuse 2 had 30sec left of burning, so doubling the burn rate will make it burn out in 15sec. 30sec for fuse 1 to burn plus 15sec for fuse 2 afterwards gives the needed 45sec.
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You don't need two fuses. One fuse and a string is enough. Tie the string to the lighter and swing it back and forth. Light the fuse and count how many oscillations you get. Congratulations you can now measure any length of time with the lighter on a string. (If you want more resolution, burn some of the string away first or put more of the length into the knot.
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You know that the jail is housing weirdos when the prisoner can
A) move Super fast
B)unable to count to 45 seconds and
C)knows that the fuse burns for exactly 60 seconds even when his watch is broken

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Answer:
Throw the objects every 15 secs. If they burn keep waiting. Eventually they wont burn and you run through. And if a hardened criminal cant count 15 seconds then I dunno what the world is anymore

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but i thought you said they burn irregularly?
Meaning those fuses could burn 52 seconds on one end and 8 seconds on the other end. Or 24 seconds on one end or 36 seconds on the other end

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how can you light the 2nd fuse while trying to escape? if you wait for 30 secs to light up the 2nd fuse you'll only have 15 seconds left to escape.
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0: 27 I only have a second or two time window to negotiate an electric fence? To be honest I would rather just stay and serve out my time!
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Would burning both halves of the first fuse than dividing the second fuse into 4 quarters and burning 4 ends of it also work?
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You find something that you might help
Me: Well that's good. :D
A lighter and 2 fuses which you make in the prison
Me: .

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