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tuananhkrongno27
2 năm trước
hai ô tô xuất phát từ a và b cùng một lúc và đi ngược chiều nhau .quãng đường ab dài 165 km . sau 1 giờ 30 phút chúng gặp nhau. a] tính vận tốc của mỗi ô tô, biết vận tốc ô tô đi từ a bằng 5/6 vận tốc của ô tô đi từ b. b] điểm gặp nhau cách b bao nhiêu ki - lô- mét ?
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