The fast and slow cars travel in opposite directions from two places at the same time. The express train is 80 kilometers per hour and the local train is 60 kilometers per hour. The speed ratio of the express train to the local train is (4 ):(3), and the distance ratio of the express train to the local train is (4):( 3).

Because; Meanwhile, the speed ratio is equal to the distance ratio.

The side length of the big and small squares is 2: 3, the ratio of the perimeters of the big and small squares is 2: 3, and the ratio of the areas of the two squares is also 2: 3. (error)

The area ratio is equal to their side length ratio or the square of their perimeter.