To find the distance traveled by Napoleon during his bus trip, you can use the equation that links speed, distance, and time. The formula for distance is:
\[ \text{Distance} = \text{Speed} \times \text{Time} \]
Given that Napoleon traveled at a speed of 55 miles per hour for 4 hours, the equation that can help you find the distance can be expressed as:
\[ \text{Distance} = 55 \text{ miles/hour} \times 4 \text{ hours} \]
However, looking closely at the options provided, the correct representation through a fraction would be:
\[ \frac{55 \text{ miles}}{1 \text{ hour}} = \frac{\text{question mark miles}}{4 \text{ hours}} \]
This option clearly indicates that you can set up a proportion with speed and time to find the distance.
Thus, the correct choice for establishing the relationship is:
\[ \frac{55 \text{ miles}}{1 \text{ hour}} = \frac{\text{question mark miles}}{4 \text{ hours}} \]