Two pipes A and B can fill a cistern in 37 1/2 minutes and 45 min...

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Two pipes A and B can fill a cistern in 37 1/2 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the pipe B is turned off after?

A. 5 min

B. 9 min

C. 10 min

D. 15 min

Answer & Explanation

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