Question

Pipe ‘A’ can fill a tank in 25 hours while pipe ‘B’ takes 30 hours to empty it. Pipe ‘A’ is opened alone when the tank was empty and after 13 hours pipe ‘B’ is also opened. In how much time will the tank get filled completely?

A 80 hours
B 84 hours
C 85 hours
D 81 hours
E None of these
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