Two pipes A and B can fill a cistern in $$37\frac{1}{2}$$ minutes and 45 minutes

Question

Two pipes A and B can fill a cistern in $$37\frac{1}{2}$$ 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:

Options:

A . 5 min.

B . 9 min.

C . 10 min.

D . 15 min.

Answer: Option B

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