A man drives from Detroit to Chicago, say 300 mi., at an average speed of  60 mi. per hr., stops 1 hr. in Chicago, and returns at a speed of 50 mi. per  hour. Neglecting variations of speed en route, write formulas expressing ? (distance from Detroit) as a function of ?.

College Algebra (MindTap Course List)
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Author:R. David Gustafson, Jeff Hughes
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Chapter2: Functions And Graphs
Section2.1: Functions And Function Notation
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A man drives from Detroit to Chicago, say 300 mi., at an average speed of 
60 mi. per hr., stops 1 hr. in Chicago, and returns at a speed of 50 mi. per 
hour. Neglecting variations of speed en route, write formulas expressing ?
(distance from Detroit) as a function of ?.

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