Question

    A man drives at a steady speed of 75 km/h for 4 hours,

    followed by another stretch of 3 hours at a consistent speed of 40 km/h. What is his average speed over the entire journey?
    A 55 km/h Correct Answer Incorrect Answer
    B 50 km/h Correct Answer Incorrect Answer
    C 60 km/h Correct Answer Incorrect Answer
    D 70 km/h Correct Answer Incorrect Answer

    Solution

    Total distance travelled by the man = 75 x 4 + 40 x 3 = 300 + 120 = 420 km Total time taken = 4 + 3 = 7 hours So, average speed = total distance travelled ÷ total time taken = 420 ÷ 7 = 60 km/h

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