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Pipes and Cisterns — Quantitative Aptitude Questions & Practice

Practise 177 Pipes and Cisterns questions from Quantitative Aptitude for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.

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Practice questions on Pipes and Cisterns — with answers

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1. Pipe A can fill a tank in 25 hours while Pipe B can empty the full tank in 36 hours. If both pipes are opened together, in how many hours will the tank be filled (given Pipe A is faster)?

A81.82
B94.09
C90
D77.73

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Answer: A

Net filling rate = |1/25 - 1/36| per hour. Time to fill = 81.82 hours.

2. Pipe A can fill a tank in 40 hours and Pipe B can fill the same tank in 30 hours. If both pipes are opened together, how long will it take to fill the tank?

A19.14
B27.14
C17.14
D25.14

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Answer: C

Combined time = (A x B)/(A+B) = (40 x 30)/(40+30) = 17.14 hours.

3. Pipe A can fill a tank in 36 hours and Pipe B can fill the same tank in 40 hours. If both pipes are opened together, how long will it take to fill the tank?

A22.95
B43.95
C18.95
D26.95

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Answer: C

Combined time = (A x B)/(A+B) = (36 x 40)/(36+40) = 18.95 hours.

4. Pipe A can fill a tank in 4 hours and Pipe B can fill the same tank in 30 hours. If both pipes are opened together, how long will it take to fill the tank?

A28.53
B3.53
C0.53
D13.53

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Answer: B

Combined time = (A x B)/(A+B) = (4 x 30)/(4+30) = 3.53 hours.

5. Pipe A can fill a tank in 25 hours and Pipe B can fill the same tank in 10 hours. If both pipes are opened together, how long will it take to fill the tank?

A11.14
B7.14
C9.14
D27.14

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Answer: B

Combined time = (A x B)/(A+B) = (25 x 10)/(25+10) = 7.14 hours.

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Pipes and Cisterns — Quantitative Aptitude Questions & Practice

Practice questions on Pipes and Cisterns — with answers

1. Pipe A can fill a tank in 25 hours while Pipe B can empty the full tank in 36 hours. If both pipes are opened together, in how many hours will the tank be filled (given Pipe A is faster)?

2. Pipe A can fill a tank in 40 hours and Pipe B can fill the same tank in 30 hours. If both pipes are opened together, how long will it take to fill the tank?

3. Pipe A can fill a tank in 36 hours and Pipe B can fill the same tank in 40 hours. If both pipes are opened together, how long will it take to fill the tank?

4. Pipe A can fill a tank in 4 hours and Pipe B can fill the same tank in 30 hours. If both pipes are opened together, how long will it take to fill the tank?

5. Pipe A can fill a tank in 25 hours and Pipe B can fill the same tank in 10 hours. If both pipes are opened together, how long will it take to fill the tank?

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