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      Question

      A man can row at 5 kmph in still water. If the velocity

      of current is 1 kmph and it takes him 5 hour to row to a place and come back, how far is the place?
      A 10 km Correct Answer Incorrect Answer
      B 14 km Correct Answer Incorrect Answer
      C 13 km Correct Answer Incorrect Answer
      D 12 km Correct Answer Incorrect Answer

      Solution

      Let the distance be x km. Speed upstream = 5 – 1 = 4 kmph Speed downstream = 5 + 1 = 6 kmph => (x/6) + (x/4) = 5 => (2x + 3x)/12 = 5 => 5x = 60 => x = 12 km

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