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Practice mode Pipes and Cistern

A pipe pours water into an empty 1200-litre tank at 15 litres per minute, while a leak loses 5 litres per minute. How long will the tank take to fill?

Correct answer D. 2 hours

Explanation

Net filling rate = 15 − 5 = 10 litres per minute. Time = 1200 / 10 = 120 minutes = 2 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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