state gov APPSC Group 4 (Pre+Mains) Mock Test 2022 Quantitative Aptitude Time and Work Pipe and Cistern
A can fill the tank in 6 min. and B can empty the filled tank in 10 min. If both time pipes are opened simultaneously then find the time taken by both the pipes to fill the tank.
1
12 min
2
18 min
3
15 min
4
20 min