Hai thành phố A và B cách nhau 240 km. Cùng lúc có một xe tải đi từ A về B với vận tốc 40 km/h, một xe con đi từ B về A với vận tốc 60 km/h. Hai xe đến A và B rồi quay lại và gặp nhau lần 2. Hỏi điểm gặp lần 2 cách A bao nhiêu ki-lô-mét?

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