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Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?

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Pipes & Cisterns Admin 2 years 2 Answers 531 views 0

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    Close to 10.5 minutes

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    ans = 14 min 40 sec

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