Question

A tank has two inlet pipes A and B and an outlet pipe
C. Pipe A can fill the tank in 6 hours, and Pipe B can fill it in 8 hours. Pipe C can empty the full tank in 4 hours. If all three pipes are opened together, how long will it take to fill the tank completely?

A 10 hours
B 12 hours
C 15 hours
D 16 hours
E 20 hours
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