SOLUTION: Melissa drove to the mountains last weekend. There was heavy traffic on the way there and the trip took 8 hours. When Melissa drove home, there was no traffic and the trip only too

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Question 1131014: Melissa drove to the mountains last weekend. There was heavy traffic on the way there and the trip took 8 hours. When Melissa drove home, there was no traffic and the trip only took 5 hours. If her average rate was 21 miles per hour faster on the trip home, how far away does Melissa live from the mountains?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
              SPEED        TIME       DISTANCE

GOING         r             8         d
 
RETURN        r+21          5         d

system%288r=d%2C5%28r%2B21%29=d%29


8r=5r%2B105
3r=105
r=35


d=35%2A8
highlight%28d=280%29