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.

8x = 5(x+21)
8x = 5x +105
3x = 105
x = 105 /3
x = 35

8 x 35 = 280 miles away

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