Question

Two pipes A and B can fill a tank in 4 hours and 7 hours respectively & a waste pipe C can empty in 8 hours. If pipes A , B & C are opened at 7am , 8am & 9am respectively, then at what time tank will be completely filled?

A 8.20 am
B 7.10 am
C 10.20 am
D 8.15 am
E None of these
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