SOLUTION: Justin drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 12 hours. When Justin drove home, there was no traffic and the trip only to

Question 938387: Justin drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 12 hours. When Justin drove home, there was no traffic and the trip only took 8 hours. If his average rate was 20 miles per hour faster on the trip home, how far away does Justin live from the mountains?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
r the rate Up
D/r = 12hr 0r
D/(r+20) = 8hr
......
12r/(r+20) = 8
12r = 8(r+20)
4r = 160
r = 40mph the rate Up
..
D = 12r = 480mi
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