Water Tank Problems

Water tank problems have puzzled not just students, but even famous engineers. In 1904, during the construction of New York’s subway system, engineers underestimated how fast water seeped into the tunnels. What should’ve taken weeks to fill with water happened overnight thanks to a leak they hadn’t accounted for. Calculating flow rates quickly became a top priority! This water tank quiz brings those real-life challenges into simple, logical water tank questions that sharpen your problem-solving skills. If you enjoy pipe and cistern questions or want to prepare for a water tank aptitude quiz, you’re in the right place. Our pipes and cistern problems with step by step answers are perfect for brushing up without feeling overwhelmed.

Water Tank Problems

A tap can fill a tank in 6 hours. How much of the tank is filled in 2 hours?

1/3

1/2

1/4

1/6

A pipe can fill a tank in 4 hours, but a leak in the bottom can empty it in 6 hours. How long will it take to fill the tank with both working?

8 hours

24 hours

12 hours

18 hours

Two pipes can fill a tank in 10 hours and 15 hours respectively. If both pipes are opened together, how long will it take to fill the tank?

5 hours

6 hours

7.5 hours

9 hours

A tank is filled in 3 hours by one pipe and emptied in 6 hours by another. If both are opened together, how long will it take to fill the tank?

8 hours

4 hours

9 hours

6 hours

A tank has three pipes A, B, and C. A and B can fill it in 6 hours and 8 hours respectively. C can empty it in 12 hours. If all three are opened together, how long to fill the tank?

4.8 hours

5.4 hours

6.8 hours

8.2 hours

A tank is being filled by two pipes. Pipe A fills it in 10 hours and Pipe B in 15 hours. After how many hours will the tank be 60% full if both pipes are opened together?

2.4 hours

4 hours

3.6 hours

6 hours

Two inlet pipes fill a tank in 12 and 18 hours respectively. A drain pipe can empty it in 9 hours. If all three are opened together, what fraction of the tank will be filled in 1 hour?

1/39

1/36

1/24

1/18

A pipe can fill a tank in 4 hours. Due to a hole, it takes 5 hours. What percentage of water is being leaked per hour?

10%

25%

20%

Pipe A fills a tank in 10 hours. Pipe B fills it in 15 hours. Pipe A is opened for 2 hours alone, then B is opened. How much total time to fill the tank?

6.8 hours

8.4 hours

4.8 hours

10.2 hours

Pipes A and B can fill a tank in 8 hours and 12 hours respectively. They are opened alternately for 1 hour each, starting with A. In how many hours will the tank be full?

6.4 hours

8.4 hours

12 hours

9.5 hours

Your score is

The average score is 30%

Sample Questions from This Quiz

Two pipes can fill a tank in 10 hours and 15 hours respectively. If both pipes are opened together, how long will it take to fill the tank?
A tank has three pipes A, B, and C. A and B can fill it in 6 hours and 8 hours respectively. C can empty it in 12 hours. If all three are opened together, how long to fill the tank?
Two inlet pipes fill a tank in 12 and 18 hours respectively. A drain pipe can empty it in 9 hours. If all three are opened together, what fraction of the tank will be filled in 1 hour?
Pipe A fills a tank in 10 hours. Pipe B fills it in 15 hours. Pipe A is opened for 2 hours alone, then B is opened. How much total time to fill the tank?
Pipes A and B can fill a tank in 8 hours and 12 hours respectively. They are opened alternately for 1 hour each, starting with A. In how many hours will the tank be full?

Try the full quiz and see how many of these you can answer!