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

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Q 1464201155.     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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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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