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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

Q36. **Two pipes can fill a tank in 18 minutes and 15 minutes. An outlet pipe can empty the tank in 45 minutes. If all the pipes are opened when the tank is empty, then how many minutes will it take to fill the tank?**

  1.  11
  2.  12
  3.  9
  4.  10

Solution : 10
Q37. **Pipe A can fill a tank in 16 minutes and pipe B cam empty it in 24 minutes. If both the pipes are opened together after how many minutes should pipe B be closed, so that the tank is filled in 30 minutes?**

  1.  20
  2.  24
  3.  23
  4.  None of these

Solution : None of these

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Q38. **Pipe A can fill a tank in 6 hours. Due to a leak at the bottom, it takes 9 hours for the pipe A to fill the tank. In what time can the leak alone empty the full tank?**

  1.  16 hours
  2.  15 hours
  3.  18 hours
  4.  17 hours

Solution : 18 hours
Q39. **A tank is filled in eight hours by three pipes A, B and C. Pipe A is twice as fast as pipe B, and B is twice as fast as C. How much time will pipe B alone take to fill the tank?**

  1.  24 hours
  2.  28 hours
  3.  32 hours
  4.  36 hours

Solution : 28 hours

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Q40. **Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?**

  1.  12 min
  2.  15 min
  3.  25 min
  4.  50 min

Solution : 12 min
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