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      Question

      The speed of a boat in still water is 200% higher than

      the speed of stream. If the boat takes 4 hours to cover 96 km downstream, find the time it will take to cover 72 km upstream.
      A 2 hrs Correct Answer Incorrect Answer
      B 8 hrs Correct Answer Incorrect Answer
      C 6 hrs Correct Answer Incorrect Answer
      D 12 hrs Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the speed of stream be 'y' km/h.

      So, speed of boat in still water = 3y km/h

      Downstream speed of boat = 3y + y = 4y km/h

      So, 4y = (96/4)

      Or, 'y' = 6

      Upstream speed of boat = 3y - y = 2y = 2 × 6 = 12 km/h

      Therefore, required time = (72/12) = 6 hours

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