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dodaihocnhevanh
2 năm trước
1xe máy đi từ A đến B cách 60 km/h với vận tốc không đổi . khi từ B về A do trời mưa , vận tốc giảm đi 10km/h so vs lúc đi nên thời gian về đến nhiều hơn lúc đi là 30 phút .hỏi lúc về xe máy đi vs vận tốc bao nhiêu? giúp mk vs nha
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