Quantitative Aptitude-Pipes & Cisterns
Quantitative Aptitude-Pipes & Cisterns
11. Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is:
- 60 gallons
- 100 gallons
- 120 gallons
- 180 gallons
12. A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?
- 20 hours
- 25 hours
- 35 hours
- Cannot be determined
13. Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?
- 1 hour
- 2 hours
- 6 hours
- 8 hours
14. Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?
- 12 min
- 15 min
- 25 min
- 50 min
15. Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?
- 10 min. 20 sec
- 11 min. 45 sec.
- 12 min. 30 sec.
- 14 min. 40 sec.
16. One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone will be able to fill the tank in:
- 81 min.
- 108 min.
- 144 min.
- 192 min.
17. A large tanker can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half?
- 15 min
- 20 min
- 27.5 min
- 30 min
18. A large tanker can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half?
- 15 min
- 20 min
- 27.5 min
- 30 min
19. Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is:
- 10
- 12
- 14
- 16