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phuonganh13112021
2 năm trước
Một người đi xe máy từ A đến B với vận tốc trung bình 40km/h. Khi quay trở về B về A người đó tăng vận tốc thêm 10km/h nên thời gian về hết ít hơn thời gian đi 30 phút. Tính quãng đường AB?
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