Start practising
Practice mode Pipes and Cistern

Pipe A fills a tank in 24 minutes and pipe B in 40 minutes. A is opened first, and after 8 minutes B is also opened. What is the total time taken to fill the tank?

Correct answer C. 18 minutes

Explanation

In 8 minutes A fills 1/3. Together they fill 1/24 + 1/40 = 1/15 per minute, so the remaining 2/3 takes 10 minutes. Total = 18 minutes.

Report a problem

Answer checked How we write and check questions

Tip: press A, B, C or D to answer, and N for the next question.

Advertisement

More Pipes and Cistern questions

See all
Advertisement
Question 03 Pipes and Cistern

How long will it take to empty the tank if both the inlet pipe A and the outlet pipe B are opened simultaneously? I. A can fill the tank in 16 minutes. II. B can empty the full tank in 8 minutes.

Correct answer B. II alone sufficient while I alone not sufficient to answer

Open question
Question 04 Pipes and Cistern

How much time will the leak take to empty the full cistern? I. The cistern is normally filled in 9 hours. II. It takes one hour more than the usual time to fill the cistern because of la leak in the bottom.

Correct answer B. II alone sufficient while I alone not sufficient to answer

Open question

Discussion

Have a question about this answer?

Your email address will not be published. Required fields are marked *

Links and website addresses are not allowed in comments.