Question

Three pipes can fill or empty a tank. Pipe A can fill the tank in 12 hours. Pipe B can fill the tank in 18 hours. Pipe C can empty a full tank in 36 hours. If all three pipes are opened together in an empty tank, in how many hours will the tank be full?

A 3 hrs
B 7 hrs
C 9 hrs
D 13 hrs
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