other govt exam BARC DAE Junior Purchase Assistant / Junior Storekeeper Mock Test Quantitative Aptitude Time and Work Pipe and Cistern
Pipe P can fill a tank in 5 minutes alone and pipe Q can fill it in 4 minutes. Pipe R alone can empty the same tank in 2 minutes. Pipe P and Q are opened together to fill the tank. After 2 minutes, pipe R is also opened. How much time pipe R will take to empty this tank?
1
20 minutes
2
30 minutes
3
18 minutes
4
28 minutes