Teaching NVS Junior Secretariat Assistant (JSA) Mock Test 2024 Quantitative Aptitude Time and Work Pipe and Cistern
Pipe A can fill a tank in 12 minutes and pipe B can empty it in 6 minutes. If the tank is 50% full, and both pipes are opened together, then the tank will be completely empty after:
1
7 minutes
2
6 minutes
3
7.2 minutes
4
6.4 minutes