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Practice mode Pipes and Cistern

Pipe B fills a tank twice as fast as pipe A. Together they fill it in 10 minutes. How long would A alone take?

Correct answer B. 30 minutes

Explanation

If A's rate is r, B's is 2r, so 3r = 1/10 and r = 1/30. A alone takes 30 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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