Question

Pipe A can fill a tank in 10 minutes, and Pipe B can fill the same tank in 15 minutes. Pipe C can empty the full tank in 30 minutes. All three pipes are opened together when the tank is empty. In how much time will the tank be completely filled?

A 7.5 mins
B 5 mins
C 10 mins
D 1.8 mins
E None of these
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