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      Question

      A train covers a distance of 80 km at the speed of 55

      km/h the next 50 km distance covers with a speed of 40 km/h and last 60 km with the speed of 80 km/h find the average speed of the train?
      A 36 km/hr Correct Answer Incorrect Answer
      B 37.8 km/hr Correct Answer Incorrect Answer
      C 41 km/hr Correct Answer Incorrect Answer
      D 57 km/hr Correct Answer Incorrect Answer
      E 55 km/hr Correct Answer Incorrect Answer

      Solution

      Since the train covers different distance with different speeds. So, Average speed = Total Distance/Total Time Total distance = 80 + 50 + 60 = 190 km Time1 = 80/55, Time2 = 50/40 & Time3 = 60/80 Total Time = 80/55 + 50/40 + 60/80 Therefore, Average Speed = 190/(80/55 + 50/40 + 60/80) = 55 km/hr

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