Physics, 25.09.2021 14:00 idcbrooo

trên cùng 1 đường thẳng có 2 xe chuyển động đều và cùng chiều, xe B đuổi theo A. Ban đầu 2 xe cách nhau 20km và chuyển động cùng lúc. Xe A chạy với tốc độ 40km/h. Xe B muốn đuổi kịp xe A chỉ trong 20p phải chạy với tốc độ là

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trên cùng 1 đường thẳng có 2 xe chuyển động đều và cùng chiều, xe B đuổi theo A. Ban đầu 2 xe cách n...

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