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      Question

      The speed of a boat in downstream is 20% more than

      speed of boat in still water. If the boat travels a distance of 90 km upstream in 15 hours then find the time taken by the boat to cover a distance of 252 km in downstream.
      A 5 hours Correct Answer Incorrect Answer
      B 3 hours Correct Answer Incorrect Answer
      C 6 hours Correct Answer Incorrect Answer
      D 8 hours Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let speed of boat in still water is ‘x’ km/h
      Speed of boat in downstream = 1.20x km/h
      Speed of boat in upstream = 0.2 x km/h
      So, 0.2 x = 90/15 = 6
      So, x = 30
      Desired time = 252/36 = 7 hours

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