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    Question

    A man drove at a steady speed of 48 km/h for 5 hours,

    and then continued at a constant speed of 40 km/h for the next 4 hours. What is his average speed for the whole journey?
    A 45 km/hr Correct Answer Incorrect Answer
    B 44(4/9) km/hr Correct Answer Incorrect Answer
    C 42 km/hr Correct Answer Incorrect Answer
    D 48 km/hr Correct Answer Incorrect Answer

    Solution

    Total distance travelled = 48 X 5 + 40 X 4 = 240 + 160 = 400 km Total time taken = 5 + 4 = 9 hours So, average speed = 400 ÷ 9 = 44(4/9) km/h Hence, option b.

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