BANK Rajasthan Cooperative Board Clerk / Junior Assistant Mock Test 2021 Quantitative Aptitude Time and Work Pipe and Cistern
Pipe A fill a cistern in 9 hours and pipe B empty the cistern in 12 hours. How much time will be taken to fill the empty cistern, if both the pipes are opened simultaneously?
1
36 hours
2
39 hours
3
42 hours
4
45 hours
5
30 hours