Pipe and Cistern (Railway Maths) (Part – II)

Total Questions: 39

11. One pipe works three times as fast as another. The two pipes together can fill a tank in 26 minutes. By working alone, how long will the slower pipe take to fill the tank? [RRB JE 26/06/2019 (Evening)]

Correct Answer: (d) 104 minutes
Solution:

12. Three pipes P, Q and R can fill a tank in 10, 15 and 20 hours separately. P was opened at 7 AM, Q at 8 AM and R at 9 AM. At what time was the tank completely filled if R can work for only 3 hours at a stretch and need a 1 hour break? [RRB JE 26/06/2019 (Evening)]

Correct Answer: (c) 12:30 PM
Solution:

13. Three pipes A, B and C together can fill a tank in 6 hours. They are open for 2 hours at first. Then C is closed and A and B fill the remaining part in 7 hours. In what time can C alone fill the tank? [RRB JE 27/06/2019 (Morning)]

Correct Answer: (b) 14 hours
Solution:

14. Ratio of the time taken by three taps P, Q and R to individually fill a cistern is 2 : 1 : 6. Which tap is the fastest? [RRB JE 27/06/2019 (Morning)]

Correct Answer: (c) Q
Solution:

15. There is a leak in a tank that can empty it in 8 hours. There is also a pipe fitted to the tank that can admit 6 litres of water per hour. The pipe is opened, but due to leak, the tank gets emptied in 12 hours. What is the capacity of the tank? [RRB JE 27/06/2019 (Morning)]

Correct Answer: (c) 144 litres
Solution:

16. Working alone, three inlet pipes A, B and C can fill a swimming pool in 12, 15 and 20 minutes respectively. If all are opened simultaneously and after 4 minutes A got blocked, and after another 1 minute B also got blocked, in what time did the inlet C could finally fill the pool ? [RRB JE 27/06/2019 (Evening) ]

Correct Answer: (a) 1 minute 40 seconds
Solution:

17. Three pipes P, Q and R can fill a tank in 30 minutes, 20 minutes and 10 minutes. When the tank is empty, all three pipes are opened while they discharge three chemical solutions S, T and U respectively. What is the proportion of solution U in the contents in the tank after 3 minutes ? [RRB JE 28/06/2019 (Evening) ]

Correct Answer: (a) 6/11
Solution:

18. Pipes P and Q when operated together fill a ditch in 12 minutes. Q and R working together can fill it in 20 minutes and P and R working together can fill it in 15 minutes. In how many minutes can all the 3 pipes when operated together fill the ditch ? [ALP Tier II 21/01/2019 (Evening) ]

Correct Answer: (b) 10 minutes
Solution:

19. Pipes A and B fill a tank at 30 m³/hr and 40 m³/hr respectively. Together they fill the tank in 4 hours. Find the volume of the tank. [ALP Tier II 21/01/2019 (Evening)]

Correct Answer: (c) 280 m³
Solution:

20. Pipe A fills a tank at the rate of 50 m³/hr. Pipe B takes 4 hours to fill the same tank. When opened together, they fill the same tank in 2 hours. Find the volume of the tank? [ALP Tier II 21/01/2019 (Morning)]

Correct Answer: (c) 200 m³
Solution: