SOLUTION: Joe and Janna leave home at the same time, traveling in opposite directions. Joe drives 45 mph and Janna drives 40 mph. In how many hours will they be 510 miles apart?

Question 554965: Joe and Janna leave home at the same time, traveling in opposite directions. Joe drives 45 mph and Janna drives 40 mph. In how many hours will they be 510 miles apart?
Answer by fcabanski(1391) (Show Source): You can put this solution on YOUR website!
The distance between them expands at their combined rates of speed, which is 45+40 = 85 mph.

D=rt
D=510, r=85mph, t is what we want to find.

510=85t
510/85=t
6=t

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