Collin and Caitlyn are 190 feet apart when they begin walking directly toward one another. Collin travels at a constant speed of 3.5 feet per second and Caitlyn travels at a constant speed of 4.5 feet per second. Let t represent the number of seconds that have elapsed since Collin and Caitlyn started walking toward one another.
Write an expression in terms of t that represents the number of feet Collin has traveled since he started walking toward Caitlyn.