Pipe A and B can fill a tank in 12 and 15 hours respectively. An outlet pipe C, can empty it in 6 hours. Initially pipes A and B are opened together, and after 5 hours pipe C is also opened. Find the time required to empty the tank?

Pipe A and B can fill a tank in 12 and 15 hours respectively. An outle

1.	Pipe A and B can fill a tank in 12 and 15 hours respectively. An outlet pipe C, can empty it in 6 hours. Initially pipes A and B are opened together, and after 5 hours pipe C is also opened. Find the time required to empty the tank?
A.	45 hours
B.	50 hours
C.	60 hours
D.
E.	None of these
Answer» B. 50 hours

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