Interstate Commerce When truckers are on long-haul drives, their driving logs must reflect their average speed. Average speed is the total distance driven divided by the total time spent driving. A trucker drove 3 hours on a freeway at 60 miles per hour and then drove 20 miles in the city. The trucker's average speed was 57.14 miles per hour.
a. Write an equation that models the situation.
b. How long was the trucker driving in the city to the nearest hundredth of an hour?