# 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 ?

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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 ?

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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?

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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

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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.

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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?

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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?

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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?

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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?

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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?

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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.

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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

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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?

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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?

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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?

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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?

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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?

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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?

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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?

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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.

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