SSC NTA Delhi University Non-Teaching 2021 Mock Test Quantitative Aptitude Time and Work Pipe and Cistern
A tank is 3/5 full. Pipe A can fill a tank in 10 min and Pipe B can empty it in 6 min. If both the pipes are left open, how long will it take to empty the tank completely?
1
12 min
2
5 min
3
7 min
4
9 min