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Practice mode Pipes and Cistern

Three pipes fill water at rates in the ratio 2 : 3 : 5. Together they fill a tank in 3 hours. How long would the slowest pipe alone take?

Correct answer B. 15 hours

Explanation

Let the rates be 2r, 3r and 5r. Then 10r = 1/3, so r = 1/30 and the slowest rate is 2/30 = 1/15. It takes 15 hours alone.

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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.

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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.

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