1 người đi xe mayd xuất phá từ A chuyển động về B cách A 630m với vận tốc là 13m/s. Cùng lúc đó 1 người đi bộ chuyển động từ B về A, sau 35 giây 2 người gap nhau. Tính vận tốc của người đi bộ .

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