Two pipes P and Q can fill a cistern in 12 and 15 minutes... — Answer & Explanation | PrepBeePakistan

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MEDIUMENGLISHMathematics

Two pipes P and Q can fill a cistern in 12 and 15 minutes respectively. Both are opened together, but at the end of 3 minutes the first is turned off. How much longer will the cistern take to fill?

Correct answer: B

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