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Practice mode Pipes and Cistern

Three pipes can fill a tank in 10, 15 and 30 hours respectively. How long will all three together take to fill it?

Correct answer A. 5 hours

Explanation

Add the hourly rates: 1/10 + 1/15 + 1/30 = 6/30 = 1/5 of the tank per hour. Time taken together = 5 hours.

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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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