匿名
匿名 發問於 科學及數學其他 - 科學 · 1 十年前

CE Physics - Position&Movement

A car travels from town A to town B. It first moves at a speed of 60km/h for 20 minutes and then at 80km/h for the rest of time. What is the car’s average speed if the distance between town A and town B is 60km ?

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1 個解答

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  • 匿名
    Lv 7
    1 十年前
    最愛解答

    A car travels from town A to town B. It first moves at a speed

    of 60km/h for 20 minutes and then at 80km/h for the rest of time. What

    is the car’s average speed if the distance between town A and town B is

    60km ?

    Time used for finished the way

    = (60-60/3)/80 + 1/3

    = 5/6 hrs

    Average speed

    = 60/(5/6)

    = 72 km/h

    資料來源: Hope can help you^^”
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