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Quantitative Aptitude :: Pipes & Cistern - Discussion

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Two pipes A and B can fill a cistern in 30 and 45 minutes respectively. Both are opened simultaneously, but after 10 minutes pipe A is closed. 10 minutes after that pipe B is closed and pipe A is reopened. How much more time does it take to fill the tank?

A6 2/3 minutes

B4 1/3 minutes

C19 minutes

D25 minutes

ENone of these

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