Pipe B fills a tank twice as fast as pipe A. Together they fill it in 10 minutes. How long would A alone take?
Correct answer B. 30 minutes
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A cistern is 3/4 full. An outlet can empty the full cistern in 12 minutes and an inlet can fill it in 18 minutes. If both are opened, how long will the cistern take to empty?
Correct answer B. 27 minutes
A tank is half full. Pipe A can fill the whole tank in 16 hours and pipe B can empty it in 24 hours. If both are opened, in how many hours will the tank be full?
Correct answer D. 24 hours
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Pipes A and B can fill a tank in 6 hours and 9 hours respectively. They are opened alternately for one hour each, starting with A. In how many hours will the empty tank be full?
Correct answer C. 7 hours
Pipes A and B can fill a tank in 10 hours and 12 hours, while pipe C can empty it in 20 hours. If all three are opened on an empty tank, how long will it take to fill?
Correct answer C. 7 hours 30 minutes
A cistern is normally filled in 5 hours, but a leak in its bottom makes it take 30 minutes longer. If the cistern is full, how long will the leak take to empty it?
Correct answer A. 55 hours
A pipe fills 2/3 of a tank in 16 minutes. How much longer will it take to fill the rest of the tank?
Correct answer B. 8 minutes
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
Pipe A fills a tank in 15 minutes. When outlet B is also open, the tank takes 40 minutes to fill. How long would B take to empty the full tank?
Correct answer C. 24 minutes
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Pipes A, B and C together fill a tank in 4 hours. A alone takes 12 hours and B alone 15 hours. How long would C alone take?
Correct answer C. 10 hours
Pipes A and B can fill a tank in 20 and 30 minutes respectively. Both are opened together, but A is turned off 5 minutes before the tank is full. How long does the tank take to fill?
Correct answer A. 15 minutes
A 600-litre tank has two inlets delivering 12 and 8 litres per minute and an outlet C. With all three open, the empty tank fills in 50 minutes. How long would C alone take to empty the full tank?
Correct answer C. 75 minutes
One pipe fills a tank 12 hours faster than another. Together they fill it in 8 hours. How long does the faster pipe take alone?
Correct answer D. 12 hours
Four identical taps fill a tank in 9 hours. How long would six such taps take?
Correct answer C. 6 hours
Three identical pipes fill a tank in 12 hours. After 4 hours one pipe is closed. What is the total time taken to fill the tank?
Correct answer C. 16 hours
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A tank measures 2.4 m by 1.5 m by 1 m. A pipe delivers 20 litres of water per minute. How long will it take to fill the empty tank?
Correct answer A. 3 hours
Pipes A and B fill a tank in 12 minutes and 16 minutes, and pipe C empties it in 8 minutes. If all three are opened on an empty tank, when will it be full?
Correct answer A. 48 minutes
Pipe A fills a tank in 24 minutes and pipe B in 40 minutes. A is opened first, and after 8 minutes B is also opened. What is the total time taken to fill the tank?
Correct answer C. 18 minutes
Pipes A and B can fill a tank in 45 minutes and 36 minutes. Both are opened together, and B is closed at some point so that the tank is full in 30 minutes. How many minutes before the tank is full was B closed?
Correct answer C. 18 minutes
An inlet fills a tank in 3 hours and an outlet empties it in 4 hours. Starting with the inlet, they are opened alternately for one hour each. After how many hours will the empty tank first be full?
Correct answer D. 17 hours