engineering recuitment DRDO CEPTAM STA B Tier I (Sr. Technical Assistant) Mock Test 2022 Quantitative Aptitude Time and Work Pipe and Cistern
Pipes A and B can fill a tank in 6 hours and 8 hours, respectively while pipe C alone can empty the full tank in 12 hours. A and B are opened together for 2 hours and then C is also opened. The total time (in hours) taken to fill the tank completely is:
1
5
2
7
3
6
4
4