To find the number of hours Madie was driving, we can use the relationship between distance, speed, and time, which is given by the formula:
\[ \text{Distance} = \text{Speed} \times \text{Time} \]
Rearranging the formula to find the time gives us:
\[ \text{Time} = \frac{\text{Distance}}{\text{Speed}} \]
In this case, the distance is 200 miles, and the speed is 50 miles per hour. Therefore, the equation we can set up is:
\[ \text{Time} = \frac{200 \text{ miles}}{50 \text{ miles per hour}} \]
This corresponds to the first equation you provided:
\[ \frac{50 \text{ miles}}{1 \text{ hour}} = \frac{200 \text{ miles}}{\text{question mark hours}} \]
This equation can be solved to find the number of hours, which will be 4 hours in this case.