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Practice mode Pipes and Cistern

Pipes A and B fill a tank in 12 minutes and 16 minutes, and pipe C empties it in 8 minutes. If all three are opened on an empty tank, when will it be full?

Correct answer A. 48 minutes

Explanation

Net rate = 1/12 + 1/16 − 1/8 = (4 + 3 − 6)/48 = 1/48 per minute. The tank fills in 48 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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