Practice Pipes and Cisterns Practice Questions with Detailed Solutions – Level 2

Pipes A and B can fill an empty tank in 12 hours and 15 hours respectively, while pipe C can empty the full tank in 20 hours. If all three pipes are opened together on the empty tank, in how many hours will the tank be full?

A pipe can fill a tank in 6 hours. Because of a leak at the bottom, the tank takes 7.5 hours to fill. In how many hours can the leak alone empty the full tank?

Pipes A and B can fill a tank in 6 minutes and 9 minutes respectively. They are opened alternately for 1 minute each, starting with A. In how many minutes will the empty tank be filled?

Pipes A and B can fill a cistern in 20 minutes and 30 minutes respectively. Both are opened together, but B is closed after some time. The cistern is then filled in a total of 15 minutes. After how many minutes was pipe B closed?

Pipe A is three times as efficient as pipe B. Together they fill a tank in 18 hours. How long will pipe B alone take to fill the tank?

A leak at the bottom of a tank can empty the full tank in 8 hours. An inlet pipe that fills water at 6 litres per minute is opened, and the full tank now empties in 12 hours. What is the capacity of the tank?

Two pipes can fill a tank in 12 hours and 16 hours respectively. Both pipes are opened together, and the first pipe is closed after 4 hours. What is the total time taken to fill the tank?

Two inlet pipes can fill a tank in 20 minutes and 30 minutes respectively. An outlet pipe drains water at 4 litres per minute. When all three pipes are opened together, the empty tank is filled in 18 minutes. What is the capacity of the tank?

Pipe A can fill a tank in 30 minutes. Pipe B is 50% more efficient than A. Pipe C is an outlet pipe that is half as efficient as B. If all three pipes are opened together on the empty tank, how long will it take to fill the tank?

Pipe A can fill a tank in 12 hours and pipe B can empty the full tank in 18 hours. The two pipes are opened alternately for 1 hour each, starting with A. After how many hours will the empty tank be completely filled?