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Question

Pipes X and Y can fill a tank in 45 minutes and 60 minutes respectively. Another pipe Z can empty the tank in 1 hour 30 minutes. If X and Z are opened first and Y is opened after 20 minutes, in how much total time will the tank be filled?

A 75 mins

B 27 mins

C 48 mins

D 65 mins

E None of these

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