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You have two non-uniform ropes and a bunch of matches. Each rope takes an hour to burn, but the two ropes are not identical, and it does not burn uniformly (i.e. after half the rope has burned, it has not been a half hour; either more or less than that has passed). How can you measure exactly 45 minutes?

Software Engineering Intern

Interviewed at Skarven Enterprises

5
Apr 11, 2011

You have two non-uniform ropes and a bunch of matches. Each rope takes an hour to burn, but the two ropes are not identical, and it does not burn uniformly (i.e. after half the rope has burned, it has not been a half hour; either more or less than that has passed). How can you measure exactly 45 minutes?

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