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Two pipes can fill a tank with tank with...

Two pipes can fill a tank with tank with water in 15 and 12 hours respectively and a third pipe can empty it in 4 hours. If the pipes be opened in order at 8,9 and 11a.m. respectively the tank will be emptied at `11 : 40\ adotmdot` b. `12 : 40\ pdotmdot` c. `1: 40\ pdotmdot` d. `2: 40\ pdotmdot`

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RS AGGARWAL-PIPES AND CISTERNS-All Questions
  1. Two pipes A and B can fill a tank in 20 and 30 hours respectively. ...

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  2. Four pipes can fill a reservoir in 15, 20, 30 and 60 hours respecti...

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  3. Two pipes can fill a tank with tank with water in 15 and 12 hours r...

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  4. Tap a fill a tank in 4 hours whereas tap B empties the full tank in...

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  5. Two pipes A and B can fill a tank in 6 hours and 4 hours respective...

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  6. Three taps A, B and C can fill tank in 12,15 and 20 hours respectively...

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  7. Pipe A can fill a tank in 10 hours, Pipe B can fill the same tank i...

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  8. A booster pump can be used for filling as well as for emptying a ta...

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  9. A leak in the bottom of a tank can empty the full Tank in 8 hours. ...

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  10. Two pipes can fill a tank in 20 and 24 minutes respectively and a w...

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  11. Two pipes A and B can fill a cistern in 37(1/2) and 45 min, respective...

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  12. A cistern can be filled by two pipes filling separately in 12 and 1...

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  13. Three pipes can fill a reservoir in 10, 15 and 20 hours respectivel...

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  14. Three pipes A, B and C can fill a tank in 6 hours. After working at...

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  15. A bath can be filled by the cold water pipe in 10 minutes and by th...

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  16. Large fresh water reservoir is fitted with two types of feeder pipe...

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  17. A town is supplied with water from a big overhead tank which is fed...

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  18. Water flows through a cylindrical pipe of internal diameter 7 cm at...

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  19. An outlet pipe can empty a cistern in 3 hours. In what time will th...

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  20. Two pipes A and B can fill a tank in 24h and 30 h respectively. If ...

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