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      Question

      A boat can travel at 12 km/h in still water. The speed

      of the stream is 3 km/h. How much time will it take for the boat to go from point A to point B and come back, if the distance between A and B is 30 km?
      A 2 hrs 10 mins Correct Answer Incorrect Answer
      B 5 hrs 20 mins Correct Answer Incorrect Answer
      C 5 hrs 45 mins Correct Answer Incorrect Answer
      D 2 hrs 25 mins Correct Answer Incorrect Answer

      Solution

      Speed downstream = 12 + 3 = 15 km/h Speed upstream = 12 − 3 = 9 km/h Time downstream = distance / speed = 30 / 15 = 2 hours Time upstream = 30 / 9 = 10/3 hours ≈ 3 hours 20 minutes Total time = 2 + 10/3 = (6 + 10)/3 = 16/3 hours = 5 hours 20 minutes.

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