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Question

A tank has two inlet pipes and one outlet pipe. Pipe A can fill the tank in 4 hours, and Pipe B can fill it in 6 hours. The outlet pipe C can empty the tank in 8 hours. If all three pipes are opened simultaneously, how much time will it take to fill the tank completely?

A 4 hours

B 5 hours

C 3.5 hours

D 4.5 hours

E None of these

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