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hongnhung86
2 năm trước
Hai ô tô xuất phát từ A và B cùng một lúc và đi ngược chiều nhau.Sau 4 giờ rưỡi chúng gặp nhau.Quãng đường AB dài 405 km. a, Tìm vận tốc của mỗi ô tô đi từ A bằng 4/5 vận tốc ô tô đi từ B. b, Điểm gặp nhau cách B bao nhiêu km ?
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