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thudag.2412
2 năm trước
Một người đi mô tô từ A đến B dài 60 km. Lúc đầu người đó muốn đi với vận tốc 5km/h. Nhưng sau 1/4 quãng đường đó người đó muốn đến sớm hơn dự định 30 phút. Hỏi ở quãng đường sau người đó phải đi với vận tốc bao nhiêu km/h? giúp mik vs ạ
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