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Question

Three pipes A, B and C are connected to a tank. Pipe A can fill the tank in 12 minutes, pipe B can fill it in 15 minutes, and pipe C can empty the full tank in x minutes. If all three pipes are opened together and the tank gets filled in exactly 10 minutes, what is the value of x?

A 18 mins

B 20 mins

C 24 mins

D 32 mins

E None of these

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