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Lvh201
2 năm trước
Hai người cùng làm một công việc thì hoàn thành trong 1h12'. Nếu người thứ nhất làm trong 10' và người thứ hai làm trong 12' thì được 2/5 công việc. Hỏi nếu làm riêng mỗi người hoàn thành công việc trong bao lâu?
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