Pipe and Cistern (SSC)

Total Questions: 50

21. Pipes A and B are filling pipes while C is an emptying pipe. A and B can fill a tank in 72 and 90 minutes respectively. When all the three pipes are opened together, the tank gets filled in 2 hours. A and B are opened together for 12 minutes, then closed and C is opened. The tank will be empty (in min) after : [SSC CGL TIER II (13/09/2019)]

Correct Answer: (b) 18
Solution:

22. Pipes A and B can fill a tank in 16 hours and 24 hours, respectively, and pipe C alone can empty the full tank in 𝓍 hours. All the pipes were opened together at 10.30 a.m., but C was closed at 2:30 p.m. If the tank was full at 8:30 p.m. on the same day, then what is the value of 𝓍 ? [SSC CGL TIER II (12/09/2019)]

Correct Answer: (d) 96
Solution:

23. Pipes A, B and C can fill a tank in 30h, 40h and 60h respectively. Pipes A, B and C are opened at 7 a.m., 8 a.m., and 10 a.m., respectively on the same day. When will the tank be full? (in p.m.) [SSC CGL TIER II (11/09/2019)]

Correct Answer: (c) 9.20
Solution:

24. A pipe can fill a tank in 18 hours. In how much time (in hours) will another pipe operating at one - third the efficiency of the first pipe fill a tank whose capacity is 50% of that of the first tank? [SSC MTS 19/08/2019 (Morning)]

Correct Answer: (d) 27
Solution:

25. An inlet pipe A originating from a river can fill a reservoir in 30 days. And an outlet pipe B, which is capable of emptying the completely filled reservoir in 50 days, drains out the water from the reservoir to an irrigation canal. The pipes are opened on alternate days starting with A. On which day from the beginning will the reservoir get completely filled for the first time ? [SSC MTS 05/08/2019 (Morning)]

Correct Answer: (b) 147th
Solution:

26. Two pipes A and B fill tank in 20 min and 30 min. respectively. If A is kept open for only 1/5 th of the total time and A and B are kept open for remaining time; then how much time is taken by both pipes to fill the tank. [SSC CPO 15/03/2019 (Evening)]

Correct Answer: (b)
Solution:

27. One - fourth of a tank can be filled in 3 hours by pipe A and one-third of the same tank can be filled in 2 hours by pipe B. How long will it take for the tank to be filled if both pipes are kept open ? [SSC CPO 14/03/2019 (Morning)]

Correct Answer: (c)
Solution:


28. Fill pipe P is 21 times faster than fill pipe Q . If Q can fill a cistern in 110 minutes, find the time it takes to fill the cistern when both fill pipes are opened together. [SSC CGL 09/09/2024 (1st Shift)]

Correct Answer: (a) 5 minutes
Solution:

29. Pipes M, N and S can fill a tank in 25, 50 and 100 minutes, respectively. Initially, pipes N and S are kept open for 10 minutes, and then pipe N is shut while pipe M is opened. Pipe S is closed 15 minutes before the tank overflows. How much time (in minutes) will it take to fill the tank if the three pipes work in this pattern? [SSC CGL 09/09/2024 (2nd Shift)]

Correct Answer: (d) 27
Solution:

30. Three pipes P, Q and R can fill a cistern in 40 minutes, 80 minutes and 120 minutes, respectively. Initially, all the pipes are opened. After how much time (in minutes) should the pipes Q and R be turned off so that the cistern will be completely filled in just half an hour? [SSC CGL 10/09/2024 (1st Shift)]

Correct Answer: (d) 12
Solution: