# Pipes and Cistern Aptitude Questions and Answers

This section focuses on "Pipes and Cistern" in Quantitative Aptitude. These Multiple Choice Questions (mcq) should be practiced to improve the Quantitative Aptitude skills required for various interviews (campus interviews, walk-in interviews, company interviews), placements, entrance exams and other competitive examinations.

1. A tube can fill a cistern in 18hrs.After half the cistern is filled, three more similar tubes are opened. What is the total time taken to fill the cistern completely ?

A. 9hrs 52min
B. 10hrs 15 min
C. 9hrs 45 min
D. 10hrs 30min

2. Two taps can fill a tank in 4 hours and 5 hours .If two taps are operate simultaneously, In how much time will the tank be filled ?

A. 4hrs 18min
B. 10min 12min
C. 2hrs 13min
D. 12hrs 10min

3. A pipe can fill the tank in 12 hours.Because of a leak in the tank it took 16(1/2) hours to fill the tank.If the tank is full,how much time will the leak take to empty it?

A. 18hrs51mins
B. 18hrs 20min
C. 18hrs 55min
D. 18hrs 40min

4. One tap can fill a tank thrice as fast as another tap. If together the two taps can fill the tank in 12 minutes, then the slower tap alone will be able to fill the tank in

A. 30 min
B. 35 min
C. 32 min
D. 33 min

5. Three taps P,Q,R can fill a bunker in 3 hrs. After working at it together for 1 hr, R is closed and P,Q can fill the remaining part in 3 hrs. The number of hrs taken by R alone to fill the bunker.

A. 7 hours
B. 8 hours
C. 9 hours
D. 10 hours

6. An electric pump can fill a cistern in 6 hrs. Because of a leak in the cistern it took 7 hrs to fill the cistern. If the cistern is full, how much time will the leak take to empty it?

A. 40 hrs
B. 42 hrs
C. 44 hrs
D. 46 hrs

7. A tank can be filled by a tap in 8 hrs while it can be emptied by another tap in 18 hrs. if both the taps are opened simultaneously, then after how much time will the cistern get filled?

A. 14 hrs 24 mins
B. 14 hrs 48 mins
C. 15 hrs 25 mins
D. 12 hrs 45 mins

8. A dumper is filled in 15hrs by 3 tubes P,Q,and R. the tube R is thrice as fast as Q and Q is thrice as fast as P. How much time will tube Q alone take to fill the tank?

A. 195 hrs
B. 190 hrs
C. 185 hrs
D. 180 hrs

9.  A tank can be filled by an inlet tap at the rate of 8 litres per minute. A leak in the bottom of a tank can empty the full tank in 16 hours. When the tank is full, the inlet is opened and due to the leak, the tank is empty in 80 hours. How many litres does the tank hold?

A. 8000 liters
B. 9560 liters
C. 8525 liters
D. 9600 liters

10. Two faucet A and Bcan fill a cistern in 6 hours and 2 hours respectively. If they are opened on alternate hours and if faucet A is opened first, in how many hours will the cistern be full?

A. 4 hrs
B. 5 hrs
C. 6 hrs
D. 7 hrs

11. Taps P, Q and R can fill a tank in 3, 4 and 5 hours respectively. If all the taps are opened together and after 30 minutes taps Q and R are turned off, find the total time in which the tank is full.

A. (279/120)
B. (259/120)
C. (299/120)
D. (309/120)

12. Three tubes A, B and C can fill a tank in 12hours. After working at it together for 4 hours, C is closed and A and B can fill the remaining part in 12 hours. The number of hours taken by C alone to fill the tank is

A. 32 hrs
B. 28 hrs
C. 40 hrs
D. 36 hrs

13. A Bunker has a leak which would empty the completely filled bunker in 20 hours. If the bunker is full of water and a tap is opened which admits 4 litres of water per minutes in the bunker, how many litres does the bunker holds?

A. 4500 liters
B. 4600 liters
C. 4800 liters
D. 5000 liters

14. One tube can fill a tank five times as fast as another tube. If together the two tubes can fill tank in 42 min, then the slower tube alone will be able to fill the tank in?

A. 252 min
B. 208 min
C. 244 min
D. 192 min

15. A cistern is filled in 15 hours by three pipes P, Q and R. The pipe R is thrice as fast as Q and Q is thrice as fast as P. How much time will pipe P alone take to fill the tank?

A. 120 hrs
B. 135 hrs
C. 195 hrs
D. Cannot be determined

16.  Three pumps, M, N and O are opened to fill a tank such that M and N can fill the tank alone in 18 min. and 23 min. respectively and O can empty it in 15 min. After 3 minutes the emptying pipe is closed. In how many minutes the tank will be full in this way?

A. 20
B. 25
C. 12
D. 18

17. Two faucet A and B can fill a tank in 20 hours and 40 hours respectively. If they are opened simultaneously. Sometimes later, tap B was closed, then it takes total 14 hours to fill up the whole tank. After how many hours B was closed?

A. 4 hrs
B. 12 hrs
C. 15.2 hrs
D. 17.6 hrs

18. A tap can fill a bunker in 4 hours. After half the bunker is filled, three more similar tap are opened. What is the total time taken to fill the bunker completely?

A. 3 hrs
B. 5 hrs
C. 2.5 hrs
D. 4.2 hrs

19. 24 tins of water fill a bunker when the capacity of each bunker is 27litres. How many tins will be needed to fill the same bunker, if the capacity of each tin is 18litres?

A. 36
B. 26
C. 46
D. 56

20. Bucket A has twice the capacity as bucket B. It takes 120 turns for bucket A to fill the empty dumper. How many turns it will take for both the buckets A and B, having each turn together to fill the empty dumper.

A. 40
B. 50
C. 70
D. 80