Final answer:
To solve for the time, t, that a car has been driving after covering 425 miles, we need the car's average speed to set up a proportion. The proportion relates distance to rate and time. Without the average speed, the calculation cannot be completed.
Step-by-step explanation:
To solve a proportion for the time, t, that a car has been driving given that it traveled 425 miles, we need to know the average speed of the car. Unfortunately, the question does not provide this information. If we had the car's average speed, let's say 'r' miles per hour, we could set up the proportion as follows:
425 miles / r mph = t hours / 1 hour
After setting up the proportion, we multiply both sides by 'r' to solve for time:
425 miles = rt hours
Now divide both sides by 'r' to find 't':
t = 425 miles / r mph
This equation would give us the time 't' in hours that the car has been driving. However, without the average speed, we cannot complete the calculation.