defence exam Agniveer Army Tradesman Mock Test Series 2025 Quantitative Aptitude Time and Work Pipe and Cistern
Pipe A can fill a tank in 4 hours whereas pipe B can empty it in 6 hours. If both the pipes are opened together then the number of hours needed for the tank to be filled is _____.
1
8 hours
2
9 hours
3
10 hours
4
12 hours