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Thuydao121
2 năm trước
Một ô tô dự định đi từ A đến B với vận tốc 40km/h. Nhưng sau khi đi được 1 giờ với vận tốc đó thì xe bị hỏng nên phải nghỉ 12 phút để sửa. Vì vậy, trên quãng đường còn lại, xe phải tăng vận tốc nên 10km/h và đã đến B sớm hơn dự định 12 phút. Tính quãng đường AB
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