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Quantitative Aptitude :: Pipes & Cistern - Discussion

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Choose the correct option.

Two pipes A and B can fill a cistern in 20 and 30 minutes respectively, and a third pipe C can empty it in 40 minutes. How long will it take to fill the cistern if all the three are opened at the same time?

A19 1/7 min

B15 1/7 min

C17 1/7 min

D7 1/7 min

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