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      Question

      A boat goes 30 km downstream in 3 hour and the same

      distance upstream in 5 hours. The speed of the boat in still water is:
      A 12 km/hr Correct Answer Incorrect Answer
      B 8 km/hr Correct Answer Incorrect Answer
      C 10 km/hr Correct Answer Incorrect Answer
      D 15 km/hr Correct Answer Incorrect Answer

      Solution

      Downstream speed = 30/3 = 10 km/hr Upstream speed = 30/5 = 6 km/hr Speed of the boat in still water = (D + U)/2 = (10+6)/2 = 8 km/hr 

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