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    Question

    A train covers a distance of 60 km at the speed of 45

    km/h the next 30 km distance covers with a speed of 40 km/h and last 100 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

    Solution

    Since the train covers different distance with different speeds. So, Average speed = Total Distance/Total Time Total distance = 60 + 30 + 100 = 190 km Time1 = 60/45, Time2 = 30/40 & Time3 = 100/80 Total Time = 60/45 + 30/40 + 100/80 Therefore, Average Speed = 190/(60/45 + 30/40 + 100/80) = 57 km/hr

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