SOLUTION: Two cars leave Pecos, Tx at the same time and both travel east on Interstate 20. The first car's speed is 70 mph and the second car's speed is 58 mph. When wull the cars be 30 mile

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Question 711746: Two cars leave Pecos, Tx at the same time and both travel east on Interstate 20. The first car's speed is 70 mph and the second car's speed is 58 mph. When wull the cars be 30 miles apart?
I am having a hard time setting up the equation. If some one could explain how to set it up I think I can solve it.
Thanks
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
The situation about the two cars is already somewhat simplified becuase the rate at which they are separating is the difference between their speeds. The both left the starting point at the same time.

The rate by which they are separating from each other is 70-30 miles per hour.
70-30=40.

40%2Am=30, for m being the time when the distance is 30 miles,
m=30%2F40 or 45 minutes.