Pipes A and B can fill a tank in 6 hours and 9 respectively and pipe C can empty the full tank in 12 hours. If all three pipes are opened together when a tank is empty, in how many hours will 35% tank be filled?

Pipes A and B can fill a tank in 6 hours and 9 respectively and pipe C

1.	Pipes A and B can fill a tank in 6 hours and 9 respectively and pipe C can empty the full tank in 12 hours. If all three pipes are opened together when a tank is empty, in how many hours will 35% tank be filled?
A.	1.9 h
B.	1.5 h
C.	1.6 h
D.	1.8 h
Answer» E.

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Pipes A and B can fill a tank in 6 hours and 9 respectively and pipe C can empty the full tank in 12 hours. If all three pipes are opened together when a tank is empty, in how many hours will 35% tank be filled?

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