Question

Three pipes A, B and C can fill/empty a tank. A can fill it in 12 hours, B in 15 hours, and C can empty a full tank in 20 hours. All three pipes are opened together. After some time, pipe C is closed and A and B together fill the remaining tank in 5 hours. If the tank is exactly full at the end, for how many hours was pipe C kept open?

A 4.5 hrs
B 2.5 hrs
C 8.4 hrs
D 9.4 hrs
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