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A pipe can fill a tank in x hours and...

A pipe can fill a tank in x hours and another pipe can empty it in `(y\ >\ x)` hours. If both the pipes are open, in how many hours will the tank be filled? `(x-y)hou r s` b. `(y-x)\ hou r s` c. `(x y)/(x-y)hou r s` d. `(x y)/(y-x)hou r s`

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RS AGGARWAL-PIPES AND CISTERNS-All Questions
  1. Water is continuously supplied from a reservoir to a locality at th...

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  2. Two pipes A and B can fill a tank in 20 and 30 minutes respectively...

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  3. A pipe can fill a tank in x hours and another pipe can empty it in ...

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  4. A tap can completely fill a water tank in 8 hours. The water tank h...

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  5. A tap can fill a tank in 48 minutes whereas another tap can empty i...

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  6. A tank with capacity T litres is empty. If water flows into the tan...

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  7. Pipes A and B can fill a tank in 20 hours and 30 hours respectively...

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  8. A pipe can fill a tank in 3 hours. There are two outlet pipes from ...

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  9. In what time would a cistern be filled by three pipes whose diamete...

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  10. A tap can fill a tank in 6 hours. After half the tank is filled, th...

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  11. A cistern has two pipes. One can till it with water in 8 hours and ...

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  12. A vessel has three pipes connected to it two to supply liquid and o...

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  13. Two pipes A and B can separately fill a cistern in 60 minutes and 7...

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  14. Eight pipes are fitted to a water tank. Some of these are water pip...

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  15. A pump can fill a tank in 2 hours. Due to a leak in the tank it takes ...

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  16. Two taps A and B can fill a tank in 5 hours and 20 hours respective...

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  17. Three pipes A, B and C can fill a tank from empty to full in 30 min...

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  18. Two pipes A and B together can fill a cistern in 4 hours. Had they ...

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  19. One pipe can fill a tank three times as fast as another pipe. If toget...

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  20. A tank is filled in 5 hours by three pipes A, B and C. The pipe C i...

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