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Quantitative Aptitude :: Pipes & Cistern - Discussion

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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 more time will it take to fill the tabk by pipe B?

A9 1/4 min

B11 1/4 min

C7 1/4 min

D8 1/4 min

ENone of these

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