Question

A tank can be filled by pipe A in 10 hours and by pipe B in 15 hours. Pipe C can empty the full tank in 12 hours. All three pipes are opened together. After some time, pipe C is closed and the tank gets completely filled in a total of 8 hours. For how many hours was pipe C open?

A 4 hrs
B 8 hrs
C 9 hrs
D 2 hrs
E None of these
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