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      Question

      A boat running downstream covers a distance of 30 km in

      2 hrs and covering the same distance upstream in 10 hrs. What is the speed of a boat in still water?
      A 4 km/hr Correct Answer Incorrect Answer
      B 7 km/hr Correct Answer Incorrect Answer
      C 9 km/hr Correct Answer Incorrect Answer
      D 8 km/hr Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Downstream speed = 30/2 = 15 km/hr Upstream speed = 30/10 = 3 km/hr So speed of boat in still water = (15 + 3)/2 = 9 km/hr

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