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Pipes P and Q can fill a tank in 20 minutes and 30 minutes respectively. If they are opened simultaneously. In how much time can they fill it?

A.	17	B.	16
C.	12	D.	11

Answer and Explanation

Answer:12

Explanation:
a pipe takes x hours to fill a tank and another takes y hours to fill it,
=>In xy / x + y hours
=> In this problem, x = 20 and y = 30
=> xy / x + y = 12

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