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Pipes and Cisterns Worksheet

Quantitative aptitude lesson 22: Pipes and cisterns · Set 213 · 40 questions
TalentJR

The method (Tank = LCM units): Tank = LCM of all the hours. Each pipe: tank ÷ its hours = units an hour. Fillers +, emptiers −. Time = tank ÷ net units an hour. One pipe alone: together rate − the other pipe’s rate.

NameDateTime takenScore ___ / 40
  1. 1.Pipes A and B together fill a tank in 3 hours. Pipe A alone fills it in 6 hours. How many hours does pipe B alone take?
  2. 2.Pipe A fills a tank in 8 hours and pipe B fills it in 24 hours. How many hours do both pipes take together?
  3. 3.A tap fills a tank in 6 hours. A leak at the bottom empties the full tank in 12 hours. With both open, how many hours does the tank take to fill?
  4. 4.Pipes A and B fill a tank in 2 and 12 hours. Pipe C empties the full tank in 4 hours. If all three are open, how many hours does the tank take to fill?
  5. 5.A tap fills a tank in 10 hours. A leak at the bottom empties the full tank in 30 hours. With both open, how many hours does the tank take to fill?
  6. 6.Pipes A and B fill a tank in 6 and 9 hours. Pipe C empties the full tank in 4 hours. If all three are open, how many hours does the tank take to fill?
  7. 7.Pipe A fills a tank in 4 hours and pipe B fills it in 12 hours. How many hours do both pipes take together?
  8. 8.A tap fills a tank in 19 hours. A leak at the bottom empties the full tank in 38 hours. With both open, how many hours does the tank take to fill?
  9. 9.Pipes A and B together fill a tank in 4 hours. Pipe A alone fills it in 8 hours. How many hours does pipe B alone take?
  10. 10.A tap fills a tank in 4 hours. A leak at the bottom empties the full tank in 12 hours. With both open, how many hours does the tank take to fill?
  11. 11.A tap fills a tank in 10 hours. A leak at the bottom empties the full tank in 12 hours. With both open, how many hours does the tank take to fill?
  12. 12.Pipes A and B together fill a tank in 4 hours. Pipe A alone fills it in 6 hours. How many hours does pipe B alone take?
  13. 13.Pipes A and B fill a tank in 7 and 14 hours. Pipe C empties the full tank in 6 hours. If all three are open, how many hours does the tank take to fill?
  14. 14.A tap fills a tank in 16 hours. A leak at the bottom empties the full tank in 32 hours. With both open, how many hours does the tank take to fill?
  15. 15.A tap fills a tank in 12 hours. A leak at the bottom empties the full tank in 14 hours. With both open, how many hours does the tank take to fill?
  16. 16.Pipes A and B together fill a tank in 2 hours. Pipe A alone fills it in 3 hours. How many hours does pipe B alone take?
  17. 17.Pipe A fills a tank in 15 hours and pipe B fills it in 30 hours. How many hours do both pipes take together?
  18. 18.A tap fills a tank in 7 hours. A leak at the bottom empties the full tank in 8 hours. With both open, how many hours does the tank take to fill?
  19. 19.Pipes A and B fill a tank in 4 and 6 hours. Pipe C empties the full tank in 12 hours. If all three are open, how many hours does the tank take to fill?
  20. 20.Pipes A and B fill a tank in 5 and 20 hours. Pipe C empties the full tank in 8 hours. If all three are open, how many hours does the tank take to fill?
  21. 21.Pipe A fills a tank in 6 hours and pipe B fills it in 30 hours. How many hours do both pipes take together?
  22. 22.Pipes A and B fill a tank in 3 and 12 hours. Pipe C empties the full tank in 4 hours. If all three are open, how many hours does the tank take to fill?
  23. 23.Pipes A and B fill a tank in 4 and 10 hours. Pipe C empties the full tank in 3 hours. If all three are open, how many hours does the tank take to fill?
  24. 24.A tap fills a tank in 4 hours. A leak at the bottom empties the full tank in 8 hours. With both open, how many hours does the tank take to fill?
  25. 25.Pipes A and B fill a tank in 6 and 10 hours. Pipe C empties the full tank in 4 hours. If all three are open, how many hours does the tank take to fill?
  26. 26.Pipes A and B together fill a tank in 10 hours. Pipe A alone fills it in 12 hours. How many hours does pipe B alone take?
  27. 27.Pipes A and B fill a tank in 10 and 20 hours. Pipe C empties the full tank in 8 hours. If all three are open, how many hours does the tank take to fill?
  28. 28.Pipes A and B together fill a tank in 2 hours. Pipe A alone fills it in 4 hours. How many hours does pipe B alone take?
  29. 29.Pipes A and B fill a tank in 15 and 18 hours. Pipe C empties the full tank in 10 hours. If all three are open, how many hours does the tank take to fill?
  30. 30.Pipe A fills a tank in 5 hours and pipe B fills it in 20 hours. How many hours do both pipes take together?
  31. 31.Pipe A fills a tank in 21 hours and pipe B fills it in 28 hours. How many hours do both pipes take together?
  32. 32.Pipes A and B fill a tank in 5 and 15 hours. Pipe C empties the full tank in 4 hours. If all three are open, how many hours does the tank take to fill?
  33. 33.A tap fills a tank in 6 hours. A leak at the bottom empties the full tank in 15 hours. With both open, how many hours does the tank take to fill?
  34. 34.A tap fills a tank in 15 hours. A leak at the bottom empties the full tank in 20 hours. With both open, how many hours does the tank take to fill?
  35. 35.A tap fills a tank in 13 hours. A leak at the bottom empties the full tank in 26 hours. With both open, how many hours does the tank take to fill?
  36. 36.Pipes A and B together fill a tank in 14 hours. Pipe A alone fills it in 28 hours. How many hours does pipe B alone take?
  37. 37.A tap fills a tank in 6 hours. A leak at the bottom empties the full tank in 10 hours. With both open, how many hours does the tank take to fill?
  38. 38.A tap fills a tank in 20 hours. A leak at the bottom empties the full tank in 40 hours. With both open, how many hours does the tank take to fill?
  39. 39.Pipes A and B together fill a tank in 5 hours. Pipe A alone fills it in 30 hours. How many hours does pipe B alone take?
  40. 40.Pipes A and B together fill a tank in 8 hours. Pipe A alone fills it in 10 hours. How many hours does pipe B alone take?

Answer key

  1. 6
  2. 6
  3. 12
  4. 3
  5. 15
  6. 36
  7. 3
  8. 38
  9. 8
  10. 6
  11. 60
  12. 12
  13. 21
  14. 32
  15. 84
  16. 6
  17. 10
  18. 56
  19. 3
  20. 8
  21. 5
  22. 6
  23. 60
  24. 8
  25. 60
  26. 60
  27. 40
  28. 4
  29. 45
  30. 4
  31. 12
  32. 60
  33. 10
  34. 60
  35. 26
  36. 28
  37. 15
  38. 40
  39. 6
  40. 40

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