Two pipes A and B can fill an empty cistern in 32 and 48 hrs, respectively. Pipe C can drain the entire cistern in 64 hrs when no other pipe is in operation. Initially, when the cistern was empty Pipe A and Pipe C were turned on. After a few hrs, Pipe A was turned off and Pipe B was turned on instantly. In all it took 112 hrs to fill the cistern. For how many hrs was Pipe B turned on?

Two pipes A and B can fill an empty cistern in 32 and 48 hrs, respecti

1.	Two pipes A and B can fill an empty cistern in 32 and 48 hrs, respectively. Pipe C can drain the entire cistern in 64 hrs when no other pipe is in operation. Initially, when the cistern was empty Pipe A and Pipe C were turned on. After a few hrs, Pipe A was turned off and Pipe B was turned on instantly. In all it took 112 hrs to fill the cistern. For how many hrs was Pipe B turned on?
A.	72
B.	70
C.	77
D.	84
Answer» B. 70

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