The total distance travelled by the car is 80 miles.
Speed is the ratio of total distance to total time. It is given by the formula:
Speed = distance / time
From the graph:
Distance = speed * time
Total distance = 20 mph * 1 hour + (30 mph * (90 - 60)/60 hour) + (50 mph * (120 - 90)/60 hour) + (40 mph * (135 - 120)/60 hour) + (20 mph * (150 - 135)/60 hour) + (10 mph * (180 - 150)/60 hour) = 80 miles
The total distance travelled by the car is 80 miles.
Find out more on Speed at: https://brainly.com/question/4931057