Question

A tank is filled up by pipe A and B in 4 minutes and 5 minutes respectively but pipe C can empty it in 3 minutes. If all the three pipes are opened together then 4/5  part of the tank can be filled in (in minutes):

A 7(5/7)
B 7(7/6)
C 6(6/7)
D 6(5/6)
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