Quantitative Aptitude Questions and Answers - Pipes and Cistern

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)

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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

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

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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?

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

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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?

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

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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?

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

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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?

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

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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?

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

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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?

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

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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?

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

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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.

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

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