Question

Two pipes A and B can fill a cistern in  27 (1/2)  minutes and 35 minutes respectively. Both pipes are opened. The cistern will be filled in just 25 minutes, if the pipe B is turned off after:

A 5(1/11) minutes
B 7(5/11) minutes
C 3(2/11) minutes
D 9(6/11) minutes
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