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    Question

    A woman drove for 5 hours at a constant speed of 60 km/h

    and then drove another 2 hours at a constant speed of 90 km/h. Find her average speed for the whole journey.
    A 68.57 km/h Correct Answer Incorrect Answer
    B 38.50 km/h Correct Answer Incorrect Answer
    C 78.44 km/h Correct Answer Incorrect Answer
    D 44.55 km/h Correct Answer Incorrect Answer

    Solution

    ATQ,

    Total distance travelled by the woman = 60 ├Ч 5 + 90 ├Ч 2 = 300 + 180 = 480 km

    Total time taken = 5 + 2 = 7 hours

    So, average speed = total distance travelled ├╖ total time taken = 480 ├╖ 7 = 68.57 km/h

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