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February 21, 2018, 05:00:49 PM
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: Burn the rope  ( 3292 )
« : May 14, 2007, 02:08:22 PM From Shrinidhi»



Burn the rope


You have two ropes, each of which takes one hour to burn completely. both of these ropes are nonhomogeneous in thickness, meaning that some parts of the ropes are chunkier than other parts of the rope. using these nonhomogeneous ropes and a lighter, time 45 minutes.

 
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« #1 : May 25, 2007, 09:32:32 PM From Poonam»

1. Ignite Rope 1 at both ends and rope 2 at 1 end
By the time Rope 1 is completely burnt it will be half an hour. Rope 2 would have burnt for half an hour and it would still have half to fully burn.

2. Now ignite the other end of rope 2. It will take 15 minutes to burn completely.

Total time will be 30 + 15 minutes = 45 minutes.
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