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tranduyen17102003
2 năm trước
Một ô tô phải đi quãng đường AB dài 120 km với thời gian đã định. ở nửa đầu đoạn đường, ô tô đã đi với vận tốc lớn hơn vận tốc dự định là 5 km/ h và ở nửa đoạn đường sau ô tô đã đi với vận tốc kém vận tốc dự định là 4 km/ h biết ô tô đến B đúng thời gian dự định. Hỏi thời gian ô tô dự định đi quãng đường AB?
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