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baogalaxyspace
2 năm trước
2 người đi bộ khởi hành ở địa điểm cách nhau 4.18km, đi ngược nhau. Người thứ 1 đi với vận tốc 5.7km/h, người thứ 2 đi với vận tốc 6.3km/h và xuất phát sau người thứ 1: 4 phút. Hỏi người thứ 2 đi trong bao lâu thì gặp người thứ 1
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