The Ford car left Hanoi for Nghe An and the Audi car left Nghe An for Ha Noi at the same time. The ratio of their speeds (the Ford car to the Audi car) was 4 : 3. The Ford decreased its speed by 25% and the Audi car increased its speed by 25% after they had passed each other.
When the Ford car reached Nghe An, the Audi car was still 20km away from Hanoi. The distance between Hanoi and Nghe An is ...... km
Trả lời kỹ càng giúp mjk nha :)))
Nghiêm cấm mấy thành phần trả lời I don't know vv.... Biết hẵng trả lời nha :)))