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Question

Pipe A can fill a tank in 20 minutes, Pipe B can fill it in 30 minutes and Pipe C can empty it in 40 minutes. All three pipes are opened together, but after some time Pipe C is closed. The tank gets completely filled in 15 minutes. For how many minutes was Pipe C opened?

A 12 mins

B 18 mins

C 10 mins

D 15 mins

E None of these

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