To determine the constant of proportionality in terms of miles per hour, we need to understand that the constant of proportionality represents the rate at which distance is traveled over time.
In the context of driving, if Mr. Rogers is driving at a constant rate, we can express this relationship as:
\[ \text{Distance} = \text{Rate} \times \text{Time} \]
Here, the constant of proportionality, which is the rate, can be expressed in miles per hour (mph).
Assuming we know the distance he traveled and the time it took, we can calculate it as:
\[ \text{Rate} = \frac{\text{Distance}}{\text{Time}} \]
So, if you provide the specific distance and time Mr. Rogers traveled, we can calculate his constant of proportionality (speed) in miles per hour. Without specific values, we can only state that the constant of proportionality is given by the formula above.