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Practice mode Pipes and Cistern

Pipes A and B can fill a tank in 24 minutes and 32 minutes respectively. Both are opened, and B is closed after some time so that the tank is full in exactly 18 minutes. For how many minutes was B open?

Correct answer A. 8 minutes

Explanation

A works all 18 minutes and fills 18/24 = 3/4. B fills the remaining 1/4, which takes 32/4 = 8 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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