According to the double number line and based on the constant of proportionality or the unit rate, the speed at which the car is traveling in miles per hour (mph) is D. 40 (which is 40 mph).
Firstly, we can convert the minutes into hours.
Secondly, to find the speed of the car or its traveling rate per hour, we divide the number of miles traveled by the time in hours.
Miles 0 20 40 60 80 100
Minutes 0 30 60 90 120 150
Rate 0 40 mph 40 mph 40 mph 40 mph 40 mph
0 (20 ÷ 30/60) (60 ÷ 90/60) (100 ÷ 150/60)
Thus, we can conclude that the car is traveling at the rate of D. 40 mph.
Complete Question:
This double number line shows the distance a car travels over a period of time.
At what rate is the car traveling in miles per hour (mph)?
A. 20
B. 30
C. 60
D. 40