Question

A tank has three pipes, X, Y, and Z. X can fill the tank in 8 hours, Y can fill it in 12 hours, and Z can empty it in 6 hours. If X, Y, and Z are opened together, how long will it take to fill the tank?

A 24 hours
B 30 hours
C 18 hours
D 20 hours
E 16 hours
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