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    Question

    A truck travels at a speed of 60 km/h from city P to

    city Q and returns to city P by the same route at a speed of 100 km/h. What is the average speed of the truck for the given journey?
    A 85 km/h Correct Answer Incorrect Answer
    B 80 km/h Correct Answer Incorrect Answer
    C 75 km/h Correct Answer Incorrect Answer
    D 70 km/h Correct Answer Incorrect Answer

    Solution

    The truck travels from P to Q at 60 km/h and returns at 100 km/h.

    Using the average speed formula for two equal distances:

    Substituting a=60 and b=100:

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