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      Question

      If a boat travels 35 km more in downstream than in

      upstream in 5 hr and if the speed of the boat in still water is 25 km/hr, then find the distance travelled by boat in downstream in 4 hr?
      A 116 Correct Answer Incorrect Answer
      B 122 Correct Answer Incorrect Answer
      C 114 Correct Answer Incorrect Answer
      D 100 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      S is the speed of boat in still water = 25 km/hr
      Speed of upstream = 25 + x
      Speed in downstream = 25 - x
      Distance in downstream - distance in upstream =35 km {given}
      According to question,
      (25 + x) times; 5 - (25 - x) times; 5 = 35
      (25 + x) - (25 - x) = 7
      2x = 7
      x = 3.5 km/hr
      Distance in downstream in 4 hr
      D = (25 + 3.5) times; 4
      D = 28.5 times; 4
      D = 114 km

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