Sunday, November 13, 2005

Measure time with two ropes and some matches

Imagine you have two ropes of different sizes. Both ropes are not of consistent thickness, i.e. each rope can be at one point thick and at another one very thin. All you know is, that each rope takes exactly one hour to burn completely.

How can you measure exactly 45 minutes by burning the ropes and without any other tool to be used than a match?

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