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      Question

      Time taken by a boat to travel certain distance in

      upstream direction is twice the time taken by the boat to cover same distance in downstream direction. If the total time needed to cover 24km upstream and 24km downstream is 3 hours, then calculate the average of speed of boat in still water and speed of stream.
      A 14 Correct Answer Incorrect Answer
      B 16 Correct Answer Incorrect Answer
      C 9 Correct Answer Incorrect Answer
      D 12 Correct Answer Incorrect Answer
      E None of the above Correct Answer Incorrect Answer

      Solution

      Let speed of boat in still water: u and speed of stream: v d/(u-v) = 2d/(u+v) => u = 3v 24/(u+v) + 24/(u-v) = 3 => v = 6km/hr Average of speed of still water and speed of stream = (u+v)/2 => 12

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