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nguyen.huy1107
2 năm trước
Một ca nô xuôi dòng từ A đến B rồi đi ngược về A. Vận tốc ca nô là 15 km/h. Vận tố nước là 3km/h, AB dài 24 km a, Tính thời gian chuyển động của ca nô b, tuy nhiên khi quay về A đi đc 7,2 km thì hỏng ca nô, sửa mất 24 phút. Muốn về A đúng dự định thì phải đi với vận tốc bao nhiêu?
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