Burning Ropes
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A rope burns non-uniformly for exactly one hour. How do you measure 45 minutes, given two such ropes?
First start burning rope 1 at both ends, and rope 2 at one end only. When rope 1 finishes burning (which will take 30 minutes), light the other end of rope 2. 45 minutes is up when rope 2 finishes burning.
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