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Câu 3: Giải bài toán bằng cách lập hệ phương trình: Một ô tô khởi hành từ A với vận tốc 50 km/h. Sau 1 giờ 15 phút ô tô thứ hai cũng khởi hành từ A đi cùng hướng với ô tô thứ nhất với vận tốc 40 km/h. Hỏi sau mấy giờ thì hai ô tô gặp nhau, điểm gặp nhau cách A bao nhiêu km?
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