Thursday, July 29, 2010

Measure time with lighted candles

You are given two candles of equal size, which can burn 1 hour each. You have
to measure 90 minutes with these candles. (There is no scale or clock). Also you have a lighter.

First light up the two ends of the 1st candle. When it will burn out light up
one end of the second candle. (30+60=90)

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