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nhinhivu.789
2 năm trước
Câu 1: Cho một xe ô tô chạy trên một quãng đường trong 5 giờ. Biết 2 giờ đầu xe chạy với tốc độ trung bình 50km/h và 3 giờ sau xe chạy với tốc độ trung bình 40km/h. Vận tốc trung bình của xe trong suốt thời gian chuyển động là: A. 45km/h B. 44km/h C. 43km/h D. 42km/h
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