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Question

Pipe ‘A’ can fill a tank in 12 hours whereas pipe ‘B’ can empty it in 30 hours. If both pipes are opened together while pipe ‘B’ is closed after 5 hours, then find the time taken by pipe ‘A’ to fill the rest of the tank.

A 12 hrs

B 8 hrs

C 9 hrs

D 18 hrs

E None of these

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