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Q:

The Ajmer express can move at 45 km./hr. without its rake and the speed is diminished by a constant that varies as the square root of the number of wagons attached. If it is known that with 9 wagons, the speed is 30 km./hr., what is the greatest number of wagons with which the train can just move?

  • 1
    63
  • 2
    64
  • 3
    80
  • 4
    81
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Answer : 4. "81"

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