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Practice mode Pipes and Cistern

A leak can empty a full cistern in 6 hours. When an inlet supplying 4 litres per minute is opened, the full cistern takes 9 hours to empty. What is the capacity of the cistern?

Correct answer B. 4320 litres

Explanation

Inlet supplies 4 × 60 = 240 litres per hour. C/6 − 240 = C/9, so C/18 = 240 and C = 4320 litres.

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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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