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      Question

      The speed of a boat in still water is 5 times more than

      that of the current. If the boat takes 10 hours to cover 200 km upstream, then find the time taken by the boat to cover 420 km downstream.
      A 14 hours Correct Answer Incorrect Answer
      B 15 hours Correct Answer Incorrect Answer
      C 16 hours Correct Answer Incorrect Answer
      D 17 hours Correct Answer Incorrect Answer

      Solution

      Let the speed of the current be ‘x’ km/hr
      Therefore, speed of the boat in still water = 6x km/hr
      According to the question,
      6x – x = 200 / 10
      Or, 5x = 20
      Or, x = 4 km/hr
      Required time taken = 420 / (6x + x) = 420 / (7 × 4) = 420/28 = 15 hours

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