Question

Pipe ‘A’ can fill a tank in 10 hours whereas pipe ‘B’ can empty it in 20 hours. If both pipes are opened together while pipe ‘B’ is closed after 4 hours, then find the time taken by pipe ‘A’ to fill the rest of the tank.

A 12 hrs
B 8 hrs
C 10 hrs
D 18 hrs
E None of these
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