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Lúc 7h hai ô tô cùng khởi hành từ hai điểm a và b cách nhau 400km và đi ngược chiều nhau . Vận tốc xe đi từ a là 38km/h , vận tốc xe đi từ b là 30km/h. A. Tìm khoảng cách giữa 2 xe lúc 9 h. B. Xác định thời điểm 2 xe gặp nhau và vị trí gặp nhau. Mn giúp mk nhanh vssss
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