Dale drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 7 hours. When Dale drove home, there was no traffic and the trip only took 5 hours. If his average rate was 18 miles per hour faster on the trip home, how far away does Dale live from the mountains? Do not do any rounding.

Question

Robles

Mathematics

6 January, 01:10

Dale drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 7 hours. When Dale drove home, there was no traffic and the trip only took 5 hours. If his average rate was 18 miles per hour faster on the trip home, how far away does Dale live from the mountains? Do not do any rounding.

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Answers (1)

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Gracie · Answer 1

Use a system of equations:

For his trip on the way there:

D = 7*s

For his trip on the way home you have:

D = 5 * (s+18)

use substitution to solve