After driving to a riverfront parking lot, Bob plans to run south along the river, turn around, and return to the parking lot, r
unning north along the same path. After running 3.25 miles south, he decides to run for only 50 minutes more. If Bob runs at a constant rate of 8 minutes per mile, how many miles farther south can he run and still be able to return to the parking lot in 50 minutes?
