Question 1139907
you drive 60 miles at 60 miles per hour and you drive 60 miles at 30 miles per hour.


r * t = d


r = rate
t = time
d = distance


when you drive 60 miles at 60 miles per hour, r * t = d becomes 60 * t = 60. 


solve for t to get t = 60 / 60 = 1.


when you drive 60 miles at 30 miles per hour, r * t = d becomes 30 * t = 60.


solve for t to get t = 60 / 30 = 2.


the total distance you traveled is 120 miles.


the total time it took is 3 hours.


r * t = d becomes r * 3 = 120


solve for r to get r = 40 miles per hour.


your average speed as 40 miles per hour.