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haik54a2
2 năm trước
lúc 8h30 1 xe máy đi từ a đến b với vận tốc 40km/h . Lúc 10h cùng ngày 1 người đi xe máy từ b đến a với vận tốc 60km/h .hỏi 2 người gặp nhau lúc mấy giờ , biết 2 người gặp nhau ở giữa đường
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