Match-box

Question:

You are given a match-box and 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). How do you do?

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Answer: Light the two ends of one candle. It takes 30 minutes to burn out totally. Then light the second candle. (30 + 60 = 90 minutes).

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