To find the unit rate of speed in miles per hour, you can use the formula:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]
In this case, Travis traveled 290 miles in 5 hours. Plugging in the values:
\[ \text{Speed} = \frac{290 \text{ miles}}{5 \text{ hours}} = 58 \text{ miles per hour} \]
So, Travis's unit rate of speed is 58 miles per hour.