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dinhhoai0409
2 năm trước
2 người đi ngược chiều nhau Từ 2 địa điểm A và B cách nhau 20 km để gặp nhau. Vận tốc của người đi từ A là 4km/giờ. Vận tốc của người đi từ B là 6km/giờ a) hỏi sau mấy giờ họ gặp nhau b) khi gặp nhau người A cách người B bao nhiêu km
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