Answer:
The constant of proportionality in miles per hour is 35.5.
Explanation:
The constant of proportionality is Oliver's speed in miles per hour. We can find this by a simple rule of three.
He traveled 124.25 miles in 3.5 hours. So how many miles he traveled in an hour?
3.5 hours - 124.25 miles
1 hour - xmiles



The constant of proportionality in miles per hour is 35.5.