To find out how far the Acela Express would travel in 8 hours, we first need to determine its speed. If it travels 775 miles in 5 hours, we can calculate the speed as follows:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} = \frac{775 \text{ miles}}{5 \text{ hours}} = 155 \text{ miles per hour} \]
Now, to find the distance it would travel in 8 hours, we use the speed we calculated:
\[ \text{Distance} = \text{Speed} \times \text{Time} = 155 \text{ miles per hour} \times 8 \text{ hours} = 1240 \text{ miles} \]
So, the Acela Express would travel 1240 miles in 8 hours.