To determine how far the Acela Express travels in 8 hours, we first need to calculate its speed based on the information provided.
The train travels 775 miles in 5 hours. We can find the speed using the formula:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} = \frac{775 \text{ miles}}{5 \text{ hours}} = 155 \text{ miles per hour} \]
Now that we know the speed of the Acela Express is 155 miles per hour, we can find out how far it travels in 8 hours:
\[ \text{Distance in 8 hours} = \text{Speed} \times \text{Time} = 155 \text{ miles per hour} \times 8 \text{ hours} = 1240 \text{ miles} \]
Thus, the Acela Express would travel 1240 miles in 8 hours.