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Why Aptitude Pipes and Cisterns is Required?

In this Aptitude section you can learn and practice Aptitude Questions with Answers based on "Pipes and Cisterns " to improve your skills in order to face written test by IT companies, interview and various entrance tests like Bank Exams, Railway Exams, ICET, GATE, CAT, GRE, MAT, etc.

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Pipes and Cistern - Aptitude Questions and Answers

This is aptitude questions and answers section on Pipes and Cisterns with an explanation for various interview, competitive examinations, and entrance tests.

Pipes and Cistern Online Test - Pipes and Cistern Quiz Details

Online Test Name Pipes and Cistern
Exam Type Multiple Choice Questions
Category Aptitude Quiz
Number of Questions 52

Pipes and Cistern Formulas

If a pipe can fill a tank in X hours, then, the part filled by 1 hours = one / X.
If a pipe can be vacant a tank in Y hours, then, part emptied in 1 hours = 1 / Y.
If a pipe can fill a tank in X hours and another pipe can vacant the full tank in Y hours, then on opening both the pipes, the net part filled in 1 hours = (1 / X) (1 / Y).
If a pipe can fill a tank in X hours and another pipe can empty the full tank in Y hours, then on opening both the pipes, the remaining part emptied in 1 hours = (1 / Y) (1 / X).
1. Two pipes A and B can fill a cistern in 20 and 30 minutes respectively, and a third pipe C can empty it in 40 minutes. How long will it take to fill the cistern if all the three are opened at the same time?
  • A. 19 1/7 min
  • B. 15 1/7 min
  • C. 17 1/7 min
  • D. 7 1/7 min
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Answer & Explanation

Answer: Option C

Explanation:

1/20 + 1/30 - 1/40 = 7/120

120/7 = 17 1/7

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2. Two pipes A and B can separately fill a tank in 2 minutes and 15 minutes respectively. Both the pipes are opened together but 4 minutes after the start the pipe A is turned off. How much time will it take to fill the tank?
  • A. 9 min
  • B. 10 min
  • C. 11 min
  • D. 12 min
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Answer & Explanation

Answer: Option B

Explanation:

4/12 + x/15 = 1

x = 10

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3. Two pipes P and Q can fill a cistern in 12 and 15 minutes respectively. Both are opened together, but at the end of 3 minutes the first is turned off. How much longer will the cistern take to fill?
  • A. 9 1/4 min
  • B. 11 1/4 min
  • C. 7 1/4 min
  • D. 8 1/2 min
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Answer & Explanation

Answer: Option B

Explanation:

3/12 + x/15 = 1

x= 11 1/4

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4. A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 4 liters a minute into the cistern, and it is emptied in 24 minutes. How many liters does the cistern hold?
  • A. 480 liters
  • B. 600 liters
  • C. 720 liters
  • D. 800 liters
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Answer & Explanation

Answer: Option A

Explanation:

1/x - 1/20 = -1/24

x = 120

120 * 4 = 480

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5. Two taps can separately fill a cistern 10 minutes and 15 minutes respectively and when the waste pipe is open, they can together fill it in 18 minutes. The waste pipe can empty the full cistern in?
  • A. 7 min
  • B. 13 min
  • C. 23 min
  • D. 9 min
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Answer & Explanation

Answer: Option D

Explanation:

1/10 + 1/15 - 1/x = 1/18

x = 9

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