Calvin's Driving Trip

Algebra Level 1

Calvin was making a trip to the University of Chicago. When he drove down, he took Lakeshore Drive, and averaged 35 miles per hour. On his way back, he took the I-94 highway, and averaged 50 miles per hour. Given that the return journey was 4 miles longer and took 6 minutes less, what is the length of the Lakeshore Drive route (in miles)?

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