Two inlet pipes X and Y can separately fill a tank in 10 min and 5 min, respectively, and a outlet pipe Z can carry off 12 liters per min. If all the pipes are opened when the tank is full, it is emptied in 1 hour. What is the capacity of the tank?

Two inlet pipes X and Y can separately fill a tank in 10 min and 5 min

1.	Two inlet pipes X and Y can separately fill a tank in 10 min and 5 min, respectively, and a outlet pipe Z can carry off 12 liters per min. If all the pipes are opened when the tank is full, it is emptied in 1 hour. What is the capacity of the tank?
A.	37.89 liters
B.	42.24 liters
C.	51.00 liters
D.	54.75 liters
E.	None of these
Answer» B. 42.24 liters

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Two inlet pipes X and Y can separately fill a tank in 10 min and 5 min, respectively, and a outlet pipe Z can carry off 12 liters per min. If all the pipes are opened when the tank is full, it is emptied in 1 hour. What is the capacity of the tank?

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