railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Time and Work Pipe and Cistern
Two pipes can fill a cistern separately in 20 minutes and 40 minutes respectively and a waste pipe can drain off 35 gallons per minute. If all three pipes are opened, the cistern gets filled in an hour. What is the capacity of the cistern?
1
500 gallons
2
600 gallons
3
750 gallons
4
800 gallons