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Question

Pipe A can fill a tank in 24 minutes, Pipe B can fill it in 36 minutes and Pipe C can empty it in 48 minutes. All three pipes are opened together, but Pipe C is closed after some time. The tank gets filled completely in 18 minutes. For how many minutes was Pipe C open?

A 10 mins

B 18 mins

C 12 mins

D 14 mins

E None of these

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