Quantitative Aptitude :: Pipes & Cistern - Discussion
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Choose the correct option.
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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