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    Question

    A car travels half of a journey at 40 km/h and the

    remaining half at 60 km/h. What is the average speed for the whole journey?
    A 20 km/h Correct Answer Incorrect Answer
    B 48 km/h Correct Answer Incorrect Answer
    C 65 km/h Correct Answer Incorrect Answer
    D 58 km/h Correct Answer Incorrect Answer

    Solution

    Let total distance = 2D km. Then each half = D km. Time for first half = D/40 hours Time for second half = D/60 hours Total time = D/40 + D/60 = (3D + 2D) / 120 = 5D / 120 = D / 24 hours Average speed = Total distance / Total time = 2D ├╖ (D/24) = 2D ├Ч (24/D) = 48 km/h

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