Pipes X and Y can fill a tank in 45 minutes and 60 minutes

Q: Answer-Pipes X and Y can fill a tank in 45 minutes and 60 minutes respectively. Another pipe Z can empty th...

ATQ,Let tank capacity be 180 litres LCM of 45, 60, 90Efficiency of X 180 45 4 litresminuteEfficiency of Y 180 60 3 litresminuteEfficiency of Z 180 90 -2 litresminuteFilled in 20 minutes 4 - 2 20 40 litresRemaining 180 - 40 140 litresTime for remaining 140 4 3 - 2 28 minutesTotal time 20 28 48 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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Pipes X and Y can fill a tank in 45 minutes and 60 minutes

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