Two pipes A and B can alone fill a tank in 6 hours and 9 hours respect – McqOptions

MCQOPTIONS

1.	Two pipes A and B can alone fill a tank in 6 hours and 9 hours respectively. Pipe C can alone empty the same tank in 6 hours. If all three pipes are opened together, then in how many hours will the tank be filled?
A.	9
B.	18
C.	8
D.	6
Answer» B. 18

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