Pipes & Cisterns · Question 24 · Medium
Pipes & Cisterns question 24
A pipe can fill a tank in 8 hours. When the tank is half full, three more pipes of the same capacity are also opened. What is the total time taken to fill the tank?
- 6 hours
- 5 1/2 hours
- 4 1/2 hours
- 5 hours
Answer and explanation
Answer: D. 5 hours
Explanation: The first half takes 4 hours. Then 4 pipes fill 4/8 = 1/2 of the tank per hour, so the remaining half takes 1 hour. Total = 5 hours.
Previous: Pipes A, B and C together fill a tank in 4 hours. After all three have run for… · Next: An inlet can fill a tank in 9 hours and an outlet can empty it in 12 hours…
Practise pipes & cisterns
Try a fresh set of pipes & cisterns questions with an explanation after every answer, free and without signing up: Pipes & Cisterns practice. Or sit a full placement mock test.
More pipes & cisterns questions
- Pipe A can fill a tank in 12 hours and pipe B in 16 hours. Both are opened…
- Two pipes together fill a tank in 6 hours. Alone, pipe A takes 5 hours less…
- Pipes A, B and C together fill a tank in 4 hours. After all three have run for…
- An inlet can fill a tank in 9 hours and an outlet can empty it in 12 hours…
- Pipe A fills a tank twice as fast as pipe B, and pipe B fills it three times…
- An inlet pipe can fill a tank in 4 hours and an outlet pipe can empty the full…
- A pipe can fill a tank in 10 hours. When the tank was half full, a leak…
- Pipes A, B and C can fill a tank in 10, 15 and 30 hours respectively. A is…
- A cistern has a small leak. Without the leak, a pipe fills it in 6 hours. One…
More quantitative aptitude practice
Time, Speed & Distance · Problems on Trains · Boats & Streams · Permutation & Combination · Probability · Data Interpretation · Mensuration · Algebra & Equations
LogicWiz Exams home · All practice topics · Placement mock tests · Daily 10 challenge