Two pipes A and B can alone fill a tank in 40 minutes and 60 minutes respectively. Pipe C can alone empty the same tank in 120 minutes. If all three pipesare opened together, then in how many minutes will the tank be filled?
1
30
2
50
3
75
4
90
Two pipes A and B can alone fill a tank in 40 minutes and 60 minutes respectively. Pipe C can alone empty the same tank in 120 minutes. If all three pipesare opened together, then in how many minutes will the tank be filled?