Two cars leave a city and head in the same direction. After 7 hours, the faster car

Brandi

New member
is 21 miles? Two cars leave a city and head in the same direction. After 7 hours, the faster car is 21 miles ahead of the slower car. The slower car has traveled 308 miles. Find the speed of the faster car.
 
Don't consider this completely correct, it's just a guess:
It seems it would make sense..
308 + 21 = 329
7/329 = 47mph
?

But that's just a guess. I had to see what it was...
 
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