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    Question

    A car travels 60 km at a speed of 40 km/h and another 90

    km at a speed of 60 km/h. What is the average speed of the car for the entire journey?
    A 48 km/h Correct Answer Incorrect Answer
    B 50 km/h Correct Answer Incorrect Answer
    C 52 km/h Correct Answer Incorrect Answer
    D 55 km/h Correct Answer Incorrect Answer

    Solution

    Time taken for the first part = 60/40 = 1.5 hours, Time taken for the second part = 90/60 = 1.5 hours, Total distance = 60 + 90 = 150 km, Total time = 1.5 + 1.5 = 3 hours, Average speed = Total distance / Total time = 150/3 = 50 km/h. Answer: b) 50 km/h.

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