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phugiazx44
2 năm trước
Tại 2 địa điểm a và b có 2 xe ô tô khởi hành cùng 1 lúc và cùng chuyển động về địa điểm c. xe khởi hành từ a phải đi với vận tốc là bao nhiêu ?để cho 2 xe đến xe cùng một lúc. biết rằng xe khởi hành từ b đi với vận tốc là v2=30km/h,khoảng cách từ a đến c là 100km và từ b đến c là 60km
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