To find the proportion to use to determine the miles traveled in one hour, we can set up the proportion based on the information given:
- The A train travels 300 miles in 8 hours.
- We want to find out how many miles were traveled in 1 hour.
The proportion can be set up as:
\[ \frac{300 \text{ miles}}{8 \text{ hours}} = \frac{x \text{ miles}}{1 \text{ hour}} \]
Where \(x\) is the number of miles traveled in one hour.
Now, to solve for \(x\):
\[ x = \frac{300 \text{ miles} \times 1 \text{ hour}}{8 \text{ hours}} \]
Calculating this gives:
\[ x = \frac{300}{8} = 37.5 \text{ miles} \]
So, the A train travels 37.5 miles in one hour.