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Pipe A can fill an empty tank in 5 hours...

Pipe A can fill an empty tank in 5 hours while pipe B can empty the full tank in 6 hours. If both are opened at the same time in the empty tank, how much time will they take to fill it up completely?

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The correct Answer is:
30 hours
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RS AGGARWAL-TIME AND WORK -EXERCISE 13A
  1. Rajan can do a piece of work in 24 days while Amit can do it in 30 day...

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  2. Ravi can do a piece of work in 15 hours while Raman can do it in 12 ho...

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  3. A and B working together can finish a piece of work in 6 days, while A...

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  4. Two motor mechanics, Taju and Siraj, working together can overhaul a s...

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  5. A, B and C can do a piece of work in 10 days, 12 days and 15 days resp...

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  6. A can do a piece of work in 24 hours while B alone can do it in 16 hou...

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  7. A ,\ B\ a n d\ C working together can do a piece of work in 8 hours. A...

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  8. A and B can finish a piece of work in 16 days and 12 days respectively...

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  9. A can do a piece of work in 14 days while B can do it in 21 days. They...

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  10. A can do (2)/(3) of a certain work in 16 days and B can do (1)/(4) of ...

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  11. A, B and C can do a piece of work in 15, 12 and 20 days respectively. ...

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  12. A and B can do a piece of work in 18 days .B and C in 24 days and A an...

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  13. A and B can do a piece of work in 12 days, B and C in 15 days respecti...

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  14. Pipes A and B can fill an empty tank in 10 hours and 15 hours respecti...

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  15. Pipe A can fill an empty tank in 5 hours while pipe B can empty the fu...

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  16. Three taps A, B and C can fill an overhead tank in 6 hours, 8 hours an...

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  17. A cistern has two inlets A and B which can fill it in 12 minutes and 1...

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  18. A pipe can fill a cistern in 9 hours. Due to a leak in its bottom, the...

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  19. Pipe A can fill an empty tank in 6 hours and pipe B in 8 hours. If bot...

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