Question

Pipe A can fill a tank in 6 hours, and Pipe B can fill it in 8 hours. Pipe C can empty the tank in 10 hours. If all three pipes are opened simultaneously, how long will it take to fill the tank?

A 4.5 hours
B 5.22 hours
C 6.5 hours
D 7.4 hours
E 8 hours
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