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Question

Pipes P and Q can fill a tank in 90 minutes and 60 minutes respectively. Another pipe R can drain the tank in 2 hours 30 minutes. Q and R are opened together. After 40 minutes, Q is turned off and P is opened. How much total time will it take to fill the tank?

A 181 mins

B 156 mins

C 175 mins

D 149 mins

E None of these

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