Two pipes A and B can fill a cistern in 37 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after:
Correct answer B. 9 min.
Tip: press A, B, C or D to answer, and N for the next question.
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More Pipes and Cistern questions
See allPipe A fills a tank in 6 hours and pipe B empties it in 8 hours. Both are opened on an empty tank, and after 12 hours B is closed. What is the total time taken to fill the tank?
Correct answer B. 15 hours
A tank is 2/5 full. Pipe A can fill the whole tank in 10 minutes and pipe B can empty it in 6 minutes. If both are opened, how long will the tank take to empty?
Correct answer D. 6 minutes
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Pipes A and B fill a tank in 12 hours, B and C in 15 hours, and A and C in 20 hours. How long would A, B and C together take?
Correct answer B. 10 hours
Pipes A and B together fill a tank in 10 hours, B and C in 12 hours, and C and A in 15 hours. How long would A alone take?
Correct answer C. 24 hours
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