Two pipes P and Q can fill a cistern in 12 minutes and 16... — Answer & Explanation | PrepBeePakistan

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MEDIUMENGLISHMathematics

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 ?

Correct answer: C

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