Pipes and Cisterns – Concept and Basics
Pipes and cisterns is another type of time and workrelated question. queries such as how long it takes to fill or empty a tank, how much work is involved, and other similar queries may be asked. There are two main elements that a candidate should understand about such questions:
An inlet is a pipe that connects to a tank and fills it with water. This is the positive kind of job done.
An outlet is a pipe that is used to drain the tank of water. This signifies a negative sort of labor performed. It could also be referred to as ‘leak’ in the question.
Important Formula for Pipes and Cisterns
Given below are a few important formulas that will help you handle pipes and cisternrelated concerns faster and more efficiently:
Tips & Tricks for Solving Questions
As competitive tests are all about time management, candidates should hunt for shortcuts that will help them finish questions faster and save time.
The following are a few strategies to help candidates solve word problems based on pipelines and cisterns easily and quickly:
 One must be familiar with words like as inlet, outlet, leak, tank filling, tank emptying, and related formulas. Only then is a candidate able to answer these questions without getting confused.
 If you are unable to solve the question, be careful not to spend too much time on a single question.
 Memorize the formulas and practice as much as you can to better comprehend the subject.
Practice Quizzes
Pipes and Cisterns Quiz 1 – Coming Soon 
Pipes and Cisterns Quiz 2 – Coming Soon  Pipes and Cisterns Quiz 3 – Coming Soon 
Sample Questions: Pipes and Cisterns – related Problems
Q1. A Pipe can fill a tank in 2N hours. After onefourth tank is filled, four more similar pipes are opened in the tank, find total time required to fill the tank completely?
 0.8N
 0.5N
 0.6N
 0.7N
 0.9N
Solution:
Q2. 14 pipes working seven hours a day can empty a completely filled oil tank in 15 days. If ‘X’ such pipes working ten hours a day can empty the same oil tanks in 7 days?
 22
 20
 21
 23
 24
Solution:
Q3. Pipe A and B alone can fill a tank in ‘x’ hours and ‘x+10’ hours respectively. If both pipes together fill the tank in 12 hours, then the time taken by B alone to fill the tank is what percent of that of A alone?
 None of these
 175%
 125%
 200%
 150%
Solution:
Q4. Three pumps A, B and C are opened to fill a tank such that B and C can fill the tank alone 18 hours and 12 hours respectively. Pipe A can empty it 15 hours After 5 hours pipe A is closed. Then how many hours the remaining tank will be filled?
 None of these
 2 hours 50 min.
 1 hours 45 min.
 1 hours 15 min.
 4hours 36 min.
Solution:
Q5. one pipe fills a water tank three times faster than another pipe. If the two pipes together can fill the empty tank in 36 min, then how much time will the slower pipe alone take to fill the tank?
 2h 24min
 2h
 1h 21min
 1h 48min
 None of these
Solution:
Q6. Two pipes A and B can fill a tank in 40 hrs and 50 hrs respectively while a third pipe C can empty the tank in 60 hrs. If all the pipes are opened together for 20 hrs and then pipe C is closed then in what time the tank can be filled?
 800/27 hours
 400/27 hours
 600/27 hours
 1600/27 hours
 None of these
Solution:
Q7. Pipe P and Q fill the tank in 8 hr and 10 hr respectively and pipe R can empty it in 20 hrs. If all the pipes are open simultaneously find how much time they will take to fill the tank 50%.
 16/7 hours
 20/7 hours
 19/7 hours
 15/7hours
 None of these
Solution:
Q8. Two pipes A and B can fill the tank in 40 and 60 minutes respectively. Both the pipes are opened together, after how many minutes should the pipe B be turned off, so that the tank be fill in 30 minutes?
a. 15 min
b. 20 min
c. 25 min
d. 28 min
e. None of these
Solution:
The questions above will help you understand how to answer Pipes and Cistern questions, as well as the kind of questions that may be asked about this topic.
Pipes and Cisterns FAQs
Q. What are pipes and cisterns?
Pipes and cisterns is another type of time and workrelated question. queries such as how long it takes to fill or empty a tank, how much work is involved, and other similar queries may be asked.
Q. How do you resolve a pipe and cistern issue?
If one pipe fills a tank in A minutes while another fills the same tank in B minutes. Then, how long will it take to fill the tank completely? (1/A) + (1/B) = (1/C), where C is the time it will take to fill the tank (in minutes).
Q. What is the efficiency of the pipelines and cisterns?
Pipes and Cistern: Aptitude Concepts Made Simple (With Pictures)
Pipes and Cistern is a subtopic of Time & Work, which is about individual efficiency with a focus on negative work. In this example, time spent filling the Cistern equals time spent completing the task; volume of the Cistern equals total work; and speed of filling the Cistern equals work efficiency.
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