Question 988094
Car A at 60 mph will go 7 miles in 7 minutes
Car B is going 13 mph faster.
Question really is, how long does it take to go 7 miles at 13 mph?  
Answer units are miles divided by miles/hour.  Units will be in hours
it is 7/13 hours or 32.31 minutes.
In that time, Car A (truck) will have traveled a total of 39.31 miles
Car B at 73 mph will travel that distance in the same time of 32.31 minutes.