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    Question

    A person travels 150 km by car at a speed of 50 km/hr,

    300 km by train at 60 km/hr, and 200 km by plane at 200 km/hr. Find the average speed of the entire journey.
    A 70 km/hr Correct Answer Incorrect Answer
    B 72.2 km/hr Correct Answer Incorrect Answer
    C 75 km/hr Correct Answer Incorrect Answer
    D 78 km/hr Correct Answer Incorrect Answer

    Solution

    Total distance = 150 + 300 + 200 = 650 km Total time = (150/50) + (300/60) + (200/200) = 3 + 5 + 1 = 9 hours Average speed = Total distance / Total time = 650 / 9 = 72.22 km/hr Correct Option: b

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