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      Question

      A boat running downstream covers a distance of 45 km in

      3 hrs while it covers the same distance upstream in 5 hrs. Then speed of the boat in still water is
      A 24 km/hr Correct Answer Incorrect Answer
      B 9 km/hr Correct Answer Incorrect Answer
      C 12 km/hr Correct Answer Incorrect Answer
      D 15 km/hr Correct Answer Incorrect Answer

      Solution

      Let the speed of boat in still water be a km/hr and that of stream be b km/hr. Therefore, 45/(a + b)= 3 β‡’ a + b = 15 ………..(i) 45/(a – b)= 5 β‡’ a + b = 9 ………..(ii) On adding, eq (i) and (ii) β‡’ 2a = 24 km/hr β‡’ a = 12 km/hr

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