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Pipes X and Y can fill a tank in 30 minutes and 60 minutes respectively. Both pipes are opened simultaneously. After how much time should X be closed so that the tank is filled in 30 minutes?

A.	44	B.	12
C.	15	D.	34

Answer and Explanation

Answer:15

Explanation:
Let us say pipe X should be closed after n minutes.
=> i.e. pipe X is in operation for n minutes and pipe Y for all the 30 minutes
=> So, n/30 + 30/60 = t
n = 15

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