The time taken by a boat to travel a distance downstream is half the time taken by it to travel the same distance upstream. What is the speed of the boat downstream if it travels 7.5 km upstream in 1 hour 30 min ? (in km/h)

  • 7.5
  • 5
  • 9
  • 10
  • None of these
  • Explanation:

    Time taken by boat upstream = 1 1/2

    =3/2 hour

    Time taken by boat downstream

    = 3/2×1/2=3/4 hour

    ∴ Speed of boat downstream

    =7.5×4/3 = 10 km/h


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The time taken by a boat to travel a distance downstream is half the time taken by it to travel the
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