Two pipes A and B can fill an empty cistern in 1.8 and 2.7 hours, respectively. Pipe C can drain the entireÂ cistern in 4.5 hours when no other pipe is in operation. Initially when the cistern was empty Pipe A andÂ Â Pipe C were turned on. After a few hours Pipe A was turned off and Pipe B was turned on instantly. In allÂ it took 5.5 hours to fill the cistern. For how many hours was Pipe B turned on?_x005F_x000D_

Two pipes A and B can fill an empty cistern in 1.8 and 2.7 hours, resp

1.	Two pipes A and B can fill an empty cistern in 1.8 and 2.7 hours, respectively. Pipe C can drain the entireÂ cistern in 4.5 hours when no other pipe is in operation. Initially when the cistern was empty Pipe A andÂ Â Pipe C were turned on. After a few hours Pipe A was turned off and Pipe B was turned on instantly. In allÂ it took 5.5 hours to fill the cistern. For how many hours was Pipe B turned on?_x005F_x000D_
A.	5
B.	4.5
C.	3
D.
Answer» C. 3

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