Okay. To solve this questions, let's add up the total number of miles traveled. 198 + 150 + 210 is 558. Jimmy's family drove 558 miles in 9 hours, but to find the average speed, we need to divide both numbers. 558/9 is 62. There. The average driving speed was 62 miles per hour.
Note: For future questions, remember that speed = distance/time (distance divided by time).