A trucker drove for 4 hours at an average speed of 60 miles per hour (mph) and then for 3 hours at an average speed of 30 mph. What was his total distance traveled? Let D_1 = first distance. Let D_2 = second distance D_1 = 4(60) D_1 = 240 miles. D_2 = 3(30) D_2 = 90 miles. Let D_1 + D_2 = total distance D_1 + D_2 = 240 miles + 90 miles D_1 + D_2 = 330 miles. The truck driver drove a total distance of 330 miles.