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Ananh14
2 năm trước
Lúc 6h sáng ôtô 1 khởi hành từ Hà Nội đi Hải Phòng với vận tốc v1 = 40km/h. Một giờ sau một ôtô thứ 2 khởi hành từ Hà Nội và đuổi theo ôtô 1 với vận tốc v2 = 60km/h. Hãy xác định quãng đường chuyển động của xexe 1 và xe 2 lúc 8 h A. 80km;60km B.60km ;80km C.50km ;40km D.70km;50km
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