Two pipes L and J can alone fill a tank in 10 hours and 12 hours respe – McqOptions

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1.	Two pipes L and J can alone fill a tank in 10 hours and 12 hours respectively. Pipe P can alone empty the same tank in 60 hours. If all three pipes are opened together, then in how many hours will the tank be filled?
A.	10
B.	15
C.	6
D.	12
Answer» D. 12

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