Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in?

Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C c

1.	Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in?
A.	1 13/17 hours
B.	2 8/11 hours
C.	3 9/17 hours
D.	4 1/2 hours
Answer» D. 4 1/2 hours

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Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in?

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