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Practice mode Pipes and Cistern

Pipes A and B fill a tank in 18 minutes and 27 minutes. How long do they take together?

Correct answer B. 10.8 minutes

Explanation

Combined rate = 1/18 + 1/27 = 5/54 per minute. Time = 54/5 = 10.8 minutes, that is 10 minutes 48 seconds.

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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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