Teaching NVS Junior Secretariat Assistant (JSA) Mock Test 2024 Quantitative Aptitude Time and Work Pipe and Cistern
Two pipes A and B can fill a tank in 1 hour and 12 minutes and 1 hour and 36 minutes respectively. If both pipes are opened together, after how many minutes, B should be closed so that the tank is full in 54 minutes?
1
30 minutes
2
24 minutes
3
20 minutes
4
18 minutes