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phuong2k2002
2 năm trước
Quãng đường Ab dài 180km.cùng một lúc , một ô tô đi từ a đến b với vận tốc 43,5 km/giờ và một xe máy đi từ a về b với vận tốc 28,5 km/ giờ.hỏi A/ Sao bao lâu thì 2 xe gặp nhau B/ chỗ hai xe gặp nhau cách a bn km C/nếu hai xe cùng khởi hành lúc 7 giờ 30 phút thì sẽ gặp nhau lúc mấy giờ
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