Aldo drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 8 hours. When Aldo drove home, there was no traffic and the trip only took 5 hours. If his average rate was 21 miles per hour faster on the trip home, how far away does Aldo live from the mountains? Do not do any rounding.
Accepted Solution
A:
8x = 5(x+21) 8x = 5x +105 3x = 105 x = 105 /3 x = 35