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huynhxuanmai2811
2 năm trước
Một ca nô xuôi dòng trên một khúc sông từ bến A đến bến B dài 80km. Sau đó ngược dòng đến địa điểm C cách bến B là 72km. Thời gian ca nô đi xuôi dòng ít hơn thời gian ngược dòng là 15 phút. Tính vận tốc riêng của ca nô, biết vận tốc dòng nước là 4km/h
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