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Practice mode Pipes and Cistern

Two taps can fill a tub in 30 minutes and 45 minutes. If both are turned on together, what fraction of the tub is filled in 6 minutes?

Correct answer B. 1/3

Explanation

Combined rate = 1/30 + 1/45 = 1/18 per minute. In 6 minutes they fill 6/18 = 1/3 of the tub.

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Question 03 Pipes and Cistern

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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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