Question: Two pipes A and B can fill a cistern in 37 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be

Two pipes A and B can fill a cistern in 37 minutes

Two pipes A and B can fill a cistern in 37 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after: (A) 5 min. B 9 min. C 10 min. D 15 min.

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