Pipes A and B can fill a tank in 30 and 20 minutes, respectively. There is also an emptying pipe C attached to the tank. If all the three pipes are opened together, the tank is filled in 15 minutes. If the tank is one-third empty, then C alone will empty the tank completely in:

Pipes A and B can fill a tank in 30 and 20 minutes, respectively. Ther

1.	Pipes A and B can fill a tank in 30 and 20 minutes, respectively. There is also an emptying pipe C attached to the tank. If all the three pipes are opened together, the tank is filled in 15 minutes. If the tank is one-third empty, then C alone will empty the tank completely in:
A.	20 minutes
B.	30 minutes
C.	40 minutes
D.	60 minutes
Answer» D. 60 minutes

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Pipes A and B can fill a tank in 30 and 20 minutes, respectively. There is also an emptying pipe C attached to the tank. If all the three pipes are opened together, the tank is filled in 15 minutes. If the tank is one-third empty, then C alone will empty the tank completely in:

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