To determine how many miles the car will travel in 8 hours at the same rate, we first need to find the rate of travel.
The car travels 250 miles in 5 hours, so we can calculate the speed:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} = \frac{250 \text{ miles}}{5 \text{ hours}} = 50 \text{ miles per hour} \]
Now, we want to find out how far the car will travel in 8 hours at this speed:
\[ \text{Distance} = \text{Speed} \times \text{Time} = 50 \text{ miles per hour} \times 8 \text{ hours} = 400 \text{ miles} \]
Thus, the car will travel 400 miles in 8 hours.