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Quynhtram123
2 năm trước
Giúp mik vs nhé!😊 Một người dự định đi hết quãng đường Ab dài 30km trong một thời gian nhất định . Sau khi đi được nửa quãng đường Ab , Người này phải nghỉ 30 phút . Vì vậy để đến được b kịp thời gian quy định , Người đó phải tăng vận tốc thêm 5km/h trên quãng đường còn lại . Tính thời gian dự định đi hết quãng đường Ab của người đó
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