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    Question

    A car travels from city X to city Y at a speed of 80

    km/h and returns to city X at a speed of 100 km/h. If the total distance is 360 km, what is the average speed of the car for the entire trip?
    A 86.89 km/h Correct Answer Incorrect Answer
    B 90 km/h Correct Answer Incorrect Answer
    C 92.67 km/h Correct Answer Incorrect Answer
    D 84 km/h Correct Answer Incorrect Answer

    Solution

    Average speed = 2xy/(x+y) where x = 80, y = 100. Average speed = 2*80*100/(80+100)┬а = 16000/180 = 88.89 km/h. Correct answer: A) 88.89 km/h

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