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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