pipes-and-cisterns

Pipes and Cisterns

Pipes and Cisterns: Cistern meaning, Pipes and Cisterns Questions, Solved Problems

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Online Aptitude Questions with Answers on Pipes and Cisterns

Q26. **Two pipes A and B can separately fill a cistern in 10 and 15 minutes respectively. A person opens both the pipes together when the cistern should have been was full he finds the waste pipe open. He then closes the waste pipe and in another 4 minutes the cistern was full. In what time can the waste pipe empty the cistern when fill?**

  1.  7 min
  2.  8 min
  3.  9 min
  4.  10 min

Solution : 8 min
Q27. **An outlet pipe can empty 2/3 rd of a cistern in 12 minutes. In 8 minutes, what part of the cistern will be emptied?**

  1.  4/9
  2.  2/3
  3.  4/7
  4.  1/6

Solution : 4/9
Q28. **Two pipes can separately fill a tank in 20 and 30 hours respectively. Both the pipes are opened to fill the tank but when the tank is full, a leak develops in the tank through which one-third of water supplied by both the pipes goes out. What is the total time taken to fill the tank?**

  1.  18 hrs
  2.  16 hrs
  3.  15 hrs
  4.  12 hrs

Solution : 16 hrs
Q29. **Two pipes function simultaneously the reservoir will be filled in 12 hours. One pipe fills reservoir 10 hours faster than the other. How many hours does the faster pipe take to fill the reservoir?**

  1.  25 hrs
  2.  28 hrs
  3.  20 hrs
  4.  35 hrs

Solution : 20 hrs

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Q30. **pipes P and Q would fill a cistern 18 and 24 minutes respectively. Both pipes being opened, find when the first pipe must be turned off so that the cistern may be just filled in 12 minutes?**

  1.  after 12 mins
  2.  after 9 mins
  3.  after 8 1/2 mins
  4.  after 10 min

Solution : after 9 mins
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Solution :

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