Rabid texas basketball fans have been known to rush out of their laboratory class at 5: 00 p. m. and immediately get on highway i-35 to arrive in waco, 100 miles away, at 7: 00 p. m. to see the baylor-longhorn basketball game. they spend 4 hours watching and then celebrating the outcome of the game, and then drive 2 hours back to austin. after they completed their trip, what is their mean velocity for their trip? mph is miles per hour