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Practice mode Pipes and Cistern

Pipe A fills a tank in 15 minutes. When outlet B is also open, the tank takes 40 minutes to fill. How long would B take to empty the full tank?

Correct answer C. 24 minutes

Explanation

B's emptying rate = 1/15 − 1/40 = 5/120 = 1/24 per minute, so B empties the full tank in 24 minutes.

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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

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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

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