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vongmai050900
2 năm trước
Một ô tô đu từ A lúc 6 giờ 45 phút và đến B lúc 9 giờ 30ph ,giữa đường ô tô dừng lại 15 phút.Vận tốc ô tô là 45km/h.a,tính độ dài quãng đường A đến B.b,lúc 14 giờ 30ph,ô tô từ B quay trở lại A với vận tốc 50km/h.hỏi ô tô bề A lúc mấy giờ
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