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duykhanhnobi
2 năm trước
1 người đi bộ có vận tốc 6km/h. cả hai người cùng khởi hành ở cùng 1 điểm A lúc 5h và cùng đi về 1 hướng trên cùng 1 con đường để đến B. sau khi đi đc 45 phút thì người di xe đạp quay lại vị trí ban đầu rồi lại tiếp tục lên đường ngay. biết hai người cùng đến B một lúc. hỏi: a) cả hai đến B lúc mấy h? b) chỗ gặp nhau cách điểm khởi hành bao nhiêu km?
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