Two pipes P and Q can fill a cistern in 12 minutes and 16 minutes respectively.

Question

Two pipes P and Q can fill a cistern in 12 minutes and 16 minutes respectively. Simultaneously both the pipes are opened together, then after how much time Q should be closed so that the tank is full in 9 min ?

Options:

A . 2 min

B . 3 min

C . 4 min

D . 5 min

Answer: Option C
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