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Question

Two pipes X and Y can fill a tank in 90 minutes and 60 minutes respectively. A third pipe Z can empty the tank in 2 hours 30 minutes. X is kept closed. Y and Z are opened together. After 40 minutes, Y is closed and X is opened. How much total time will it take to fill the tank?

A 142 mins

B 175 mins

C 185 mins

D 165 mins

E None of these

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