Question

A tank can be filled by pipe A in 20 minutes and by pipe B in 30 minutes. There is also a leak at the bottom of the tank that can empty a full tank in 60 minutes. If all three (A, B and the leak) are opened together when the tank is empty, in how many minutes will the tank be full?

A 10 mins
B 15 mins
C 18 mins
D 20 mins
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