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:

Two pipes A and B can fill a cistern in 37 minutes and 45 minutes res

1.	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.
Answer» C. 10 min.

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