Question

Mary is traveling cross country on a road trip. So far, Mary has traveled 200 miles in her car and 200 miles by train. The car traveled at a rate that was 30 miles per hour slower than the train.

Mary modeled the total time for her trip with the following expression.

What does x - 30 represent in this situation?

Answer 1

The answer to your problem is, x-30 is speed of the car.

Explanation:

Let the object is moving n miles in one hour.

Let the speed is m miles per hour.

We know that our friend Mary has traveled 200 miles in her car and 200 miles by train. And shown Mary also modeled the total time for her trip;

`(200)/(x)` +
`(200)/(x-30)`

The car that was given had traveled at a rate that was 30 miles per hour slower than the train.

speed of the train is x miles per hour

speed of the car = x - 30 miles per hour.

Thus the answer to your problem is, x-30 is speed of the car.