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Puzzle of the week
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Puzzle #451 - Timing with ropes
13-Jan-17
Views : 839
Rated 5.0 by 1 User
 
You have two ropes, each of which takes two hours to burn if lit at one end. These ropes are not homogeneous and some parts of the rope burn more quickly than the other parts. If you cut the rope into half, you cannot assume that the half rope will take one hour to burn. 

Use these ropes to measure 1hr 30 min.
 Solution




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