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thuyquyen5114
2 năm trước
quãng đường AB dài 60 km.Cùng một lúc hai xe xuất phát ở A và B.Sau 4 giờ thì ô tô đi từ A đuổi kịp ô tô đi từ B tại C. a, Tìm vận tốc của mỗi ô tô biết tỉ số vận tốc của 2 ô tô là 3/4 b, tính quãng đường BC
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