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baobui2510
2 năm trước
Bài 3. Một người đi xe đạp với vận tốc v1 = 8km/h và một người đi bộ với vận tốc v2 = 4km/h khởi hành cùng một lúc ở cùng một nơi và chuyến động ngược chiều nhau. Sau khi đi được 30phút, người đi xe đạp dừng lại, nghỉ 30phút rồi quay trở lại đuổi theo người đi bộ với vận tốc như cũ. Hỏi kế từ lúc khởi hành sau bao lâu người đi xe đạp đuổi kip người đi bộ? Giúp e vs em cốt 5 sao. Lm bài3 thôi nhé
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