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If the hot water tap can fill a bathtub in 60 minutes, and the cold water tap fills it in 30 minutes, how many minutes does it take when they are running together?

 Jun 27, 2020
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1/60   +1/30 = 1/x

(1+2)/60 = 1/x

60/3 = x = 20 min

 Jun 27, 2020

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