Câu 9: Hùng thực hiện được một công 36KJ trong 10 phút. Hiếu thực hiện được một công 42KJ trong thời gian 14 phút. Ai làm việc khoẻ hơn? A. Hùng làm việc khoẻ hơn Hiếu; B. Hiếu làm việc khoẻ hơn Hùng. C. Hai người làm việc khoẻ như nhau. D. Không so sánh được.

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