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Mathematics, 16.06.2021 15:10 Alizerodriguez2010

Hai người thợ cùng làm một công việc trong 4 giờ thì xong. Nếu người thứ nhất làm 4 giờ và người thứ hai làm trong 3 giờ thì chỉ hoàn thành được 80% công việc. hỏi nếu làm riêng thì mỗi người hoàn thành công việc trong bao lâu?

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Hai người thợ cùng làm một công việc trong 4 giờ thì xong. Nếu người thứ nhất làm 4 giờ và người thứ...
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