Mathematics, 22.07.2021 14:00, abc236

2 người cùng khởi hành cùng 1 lúc từ A đến B trên đoạn đường dài 60km . Vận tốc người thứ nhất 12km/h , vận tốc người thứ hai là 15km/h . Hỏi sau bao lâu từ lúc khởi hành , người thứ nhất cách B một quãng đường gấp 2 lần khoảng cách người 2 đến B

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2 người cùng khởi hành cùng 1 lúc từ A đến B trên đoạn đường dài 60km . Vận tốc người thứ nhất 12km/...