Question

    The average speed of a car over the first 4 hours is 50

    km/h. If the car needs to maintain an average speed of 60 km/h over a total of 8 hours, what should be its average speed for the remaining hours?
    A 50 km/h Correct Answer Incorrect Answer
    B 70 km/h Correct Answer Incorrect Answer
    C 90 km/h Correct Answer Incorrect Answer
    D 20 km/h Correct Answer Incorrect Answer

    Solution

    ATQ,

    Total distance required = 60 × 8 = 480 km

    Distance covered in 4 hours = 50 × 4 = 200 km

    Required distance = 480 - 200 = 280 km

    Required average speed in remaining hours = 280 ÷ 4 = 70 km/h

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