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Practice mode Pipes and Cistern

Pipe A can fill a tank in 12 hours and pipe B in 18 hours. If both are opened together, how long will they take to fill the empty tank?

Correct answer C. 7 hours 12 minutes

Explanation

Combined rate = 1/12 + 1/18 = 5/36 per hour, so time = 36/5 = 7.2 hours = 7 hours 12 minutes.

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Question 02 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 03 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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