Vào lúc 7h sáng có hai ô tô chuyển động đều ngược chiều nhau từ 2 địa điểm A và B cách nhau 100km. coi chuyển động của 2 xe là thẳng đều và vận tốc xe thứ nhất là 60km'h và xe thứ hai là 40km/h.
a Hỏi lúc mấy giờ hai xe gặp nhau
b. Lần đầu tiên chúng cách nhau 25km vào thời điểm nào
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