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dieuhuong040
2 năm trước
1.Hai ng đi từ A đến B,vận tốc ng thứ nhất là 40km/h,vận tốc ng thứ 2 là 25km/h.Để đi hết quãng đg AB ,ng thứ nhất cần ít hơn ng thứ 2 là 1h 30 phút.Tính quãng đg AB?
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