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haingoc995
2 năm trước
Đề bài : Một người đi bộ từ A lúc 7 giờ với vận tốc là : 5km/giờ. Đến 9 giờ 30 phút, một người đi xe đẹp từ A để đuổi theo người đi bộ với vận tốc là : 15km/giờ. Hỏi : a, Sau mấy giờ, xe đạp đuổi kịp người đi bộ ? b, Chỗ gặp cách A mấy km ? c, Chỗ gặp cách B mấy km ? Biết Quãng đường AB dài : 50km.
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