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Mathematics 15 Online
OpenStudy (anonymous):

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

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