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vominhtan1112012
2 năm trước
bạn Bi và bạn an chạy thi,họ cùng xuất phát từ A và chạy đến B.bạn Bi chạy nửa quãng đường đầu vs vận tốc 9km/h, nửa quãng đường còn lại vs vận tốc 6km/h.bạn an chạy nửa thời gian đầu với vận tốc 9km/h,nửa thời gian sau vs vận tốc 6km/h.Theo mọi người,bạn nào về đích trước?
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