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hatrang2002
2 năm trước
Lúc 7h một người đi bộ từ A đến B với vận tốc 4km/h. Lúc 9h một người đi xe đạp đuổi theo với vận tốc 12km/h. a) Tính thời điểm và vị trí họ gặp nhau. b) Tìm thời điểm sau khi hai xe gặp nhau cách nhau 2km. c) lúc mấy giờ họ cách nhau 2km. (giải ra rõ ràng cho mk với mk cần gấp)
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