y2 = 0.28 * x；

For the same money, x 1 kg can be transported by rail and x2 kg by road:

0.58 * x 1 = 0.28 * x2；

x 1/x2 = 0.28/0.58 & lt； 1

So x 1 is smaller than x2, so there is less railway transportation and more road transportation.

To transport the same amount of milk, the railway needs 1 yen and the road needs 2 yen.

y 1 / 0.58 = y2 / 0.28

y 1/y2 = 0.58/0.28 & gt； 1

So y 1 is larger than y2, so it costs more to use railways and less to use highways.

There are other expenses, 600 yuan, which have nothing to do with the conditions of 1.500 yuan, 1.500 kg.

There is something wrong with the problem.