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hoaithuongg124
2 năm trước
Lúc 7 giờ sáng một người đi xe đạp khởi hành từ địa điểm A với vận tốc 10km/h. Sau đó lúc 8 giờ 40 phút sáng cùng ngày, một người khác đi xe máy đuổi theo với vận tốc 30km/h. Hỏi hai người gặp nhau lúc mấy giờ? Khi gặp nhau người đi xe đạp cách A bao nhiêu km?
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