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Question

Pipes A and B can fill a cistern in 48 and 80 minutes respectively. Another pipe C can empty the cistern in 1 hour 36 minutes. A and C are opened first. After 30 minutes, B is turned on. Find the total time taken to fill the cistern.

A 75 mins

B 27 mins

C 60 mins

D 65 mins

E None of these

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