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popyngock
2 năm trước
Hai thành phố A và B cách nhau 630 km. Từ A một xe máy và một ô tô xuất phát cùng một lúc đi đến B với vận tốc lần lượt là 40 km/h và 60km/h. Cùng lúc đó một xe khách từ B đi về A với vận tốc 55km/h. Hỏi sau bao lâu xe khách sẽ cách đều ô tô và xe máy?
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