railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Time and Work Pipe and Cistern
Two inlet pipes A and B can fill a tank with water in 20 minutes and 36 minutes respectively The third pipe C can empty the tank in 45 minutes. First A and B are opened. After 9 minutes C is opened Find the total time (in minutes) in which the tank will be filled up.
1
13 minutes
2
12 minutes
3
10 minutes
4
14.4 minutes