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dinhvnpd
2 năm trước
Cùng 1 lúc Hùng đi từ A đến B , còn Dũng đi từ B đến A.Hai bạn gặp nhau lần đầu ở điểm C cách A 3km ,rồi lại tiếp tục đi. Hùng đi đến B rồi quay lại A ngay ,còn Dũng đi đến A rồi quay lại B ngay 2 bạn gặp nhau 1 lần nữa ở điểm D cách điểm B 2km .Tính quãng đường AB và cho biết ai đi nhanh hơn?
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