A passenger car and a freight car leave from a and B at the same time. The speed of the freight car is 45 times that of the passenger car. After 14 kilometers of the whole journey, the freight car runs 28 kilometers to meet the passenger car. How many kilometers are there between a and B?

A passenger car and a freight car leave from a and B at the same time. The speed of the freight car is 45 times that of the passenger car. After 14 kilometers of the whole journey, the freight car runs 28 kilometers to meet the passenger car. How many kilometers are there between a and B?

A: the distance between a and B is 144 km

The speed of the freight car is 4 / 5 of that of the passenger car. After a quarter of the whole journey, the freight car will walk 28 kilometers to meet the passenger car. Is there a distance of several thousand meters between a and B?
It's better to be a linear equation of one variable, or an arithmetic,

When the lorry runs a quarter of the way,
1 / 4 △ 4 / 5 = 5 / 16,
When the truck is 28 km, the bus is 28 △ 4 / 5 = 35 km,
So the distance between a and B is (28 + 35) / [1 - (1 / 4 + 5 / 16)] = 144 km