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nhobestdien
2 năm trước
Hai đội công nhân cùng làm một công việc trong 4 giờ thì xong. Nếu mỗi đội làm một mình thì để xong công việc thì đội thứ nhất làm ít hơn đội thứ hai là là 6 giờ. Hỏi nếu làm một mình thì mỗi đội phải làm trong bao nhiêu giờ để xong công việc?
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