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    Question

    Amit travels the first 20% of his journey at a constant

    speed of 40 km/h and covers the remaining 320 km at a constant speed of 32 km/h. What is his average speed for the entire journey?
    A 24.25 kmph Correct Answer Incorrect Answer
    B 33.33 kmph Correct Answer Incorrect Answer
    C 18.18 kmph Correct Answer Incorrect Answer
    D 12.12 kmph Correct Answer Incorrect Answer

    Solution

    ATQ,
    Total journey = 320 ├╖ 0.8 = 400 km
    Average speed = Total distance covered ├╖ Total time taken
    Time taken to cover 20% of the journey = {(400 ├Ч 0.2)/40} = 2 hours
    Time taken to cover the remaining journey = (320/32) = 10 hours
    So, average speed = 400/12 ~ 33.33 km/h

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