15. The distance a car travels can be found using the formula d= r. t, where d is distance, r is the rate of speed, and t is time. If the car has traveled 120 miles in 3 hours, what is the average rate of speed?

A. 30 miles per hour

B. 40 miles per hour

C. 60 miles per hour

D. 360 miles per hour

Option B. 40 miles per hour

Step-by-step explanation:

Distance = rate of speed ×  time

If Distance = 120 miles and time = 3 hours

we will have

120 = r × 3

120 = 3r

Divide both sides by 3 and we will have

3r/3 = 120/3

r = 40

maybe - definition of supplementary angles. im not sure. sorry

step-by-step explanation: