Question

A tank is filled with 3 inlet pipes and 2 outlet pipes. Inlet pipes A, B, and C can fill the tank in 6 hours, 8 hours, and 12 hours, respectively. Outlets D and E can empty the tank in 9 hours and 15 hours, respectively. If all the pipes are opened simultaneously, how long will it take to fill the tank?

A 5 hours
B 6 hours
C 4.5 hours
D 4 hours
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