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Three candles which can burn, 60 minutes, 80 minutes and 100 minutes respectively are lit at different times...

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Three candles which can burn, 60 minutes, 80 minutes and 100 minutes respectively are lit at different times. All the candles are burning simultaneously for 30 minutes, and there is a total of 40 minutes in which exactly one is burning. For how many minutes are exactly two candles burning?

posted Jul 15, 2016 by anonymous

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