nguyennttamm0810 nguyennttamm0810

22-07-2021
English

contestada

Một ô tô di chuyển từ A và đến B trong 5 giờ, trong đó, 2 giờ đầu di chuyển với tốc độ 50km/h và 3 giờ tiếp theo sau di chuyển với tốc độ 30km/h. Tính vận tốc trung bình trên toàn đoạn đường AB của ô tô ? A. 45 km/h. B. 38 km/h. C. 47 km/h. D. 32 km/h.

Respuesta :

coangduc1401 coangduc1401

22-07-2021

Answer:

b

Explanation

2h đầu đi được 100km

3h sau đi được 90km

=> AB = 190km đi trong 5h

vận tốc trung bình = 190/5=38km/h

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