Question

A tank can be filled by pipe A in 6 hours and by pipe B in 8 hours. A waste pipe C can empty the full tank in 12 hours. If all three pipes are opened together when the tank is empty, in how many hours will the tank be filled?

A 7 hours 40 minutes
B 2 hours 49 minutes
C 4 hours 48 minutes
D 4 hours 28 minutes
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