Pipes & Cisterns · Question 2 · Easy
Pipes & Cisterns question 2
A tap fills a tank in 6 hours, while an outlet empties the full tank in 9 hours. If both are opened on an empty tank, in how many hours will it be full?
- 3 3/5 hours
- 15 hours
- 18 hours
- 12 hours
Answer and explanation
Answer: C. 18 hours
Explanation: Net rate = 1/6 − 1/9 = 1/18 tank per hour, so the tank fills in 18 hours.
Previous: Pipe A can fill a tank in 10 hours and pipe B can fill it in 15 hours. If both… · Next: A pipe fills a 1,200-litre tank in 4 hours. At the same rate, how many litres…
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 10 hours and pipe B can fill it in 15 hours. If both…
- A pipe fills a 1,200-litre tank in 4 hours. At the same rate, how many litres…
- Two pipes fill a cistern in 12 minutes and 20 minutes respectively. What…
- A leak at the bottom of a full tank empties it in 8 hours. What part of the…
- A pipe can fill a tank in 4 hours. Because of a leak, it takes 5 hours to…
- Pipes A and B fill a tank in 20 minutes and 30 minutes respectively, and pipe…
- Pipes P and Q can fill a tank in 12 hours and 18 hours. Both are opened for 4…
- One pipe fills a tank three times as fast as another. Together they fill it in…
- An outlet can empty a full tank in 10 hours. If an inlet that lets in 6 litres…
- Pipes A and B can fill a tank in 15 minutes and 20 minutes. Both are opened…
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