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March 08 2013


Two fuses

Imagine that you have two lengths of fuse like that and each takes exactly 1 hour to burn. But the fuses don't burn evenly and they're both likely to be different. So let's say a fuse is 1 foot long and it takes 40 minutes for the first inch to burn and then only 20 minutes for next 11 inches to burn. Or it could be 12 minutes for the first 4 inches and 48 minutes for the last 8 inches to burn. All you know is that the fuses are not identical and that they each take 1 hour to burn completely.

Now using only these two fuses and a cigarette lighter, how do you measure 15 minutes?
Tags: riddle

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