Question

the morris family drove 405 miles in 9 hours. what was their average speed in miles per hour?
a. 35 mph
b. 40 mph
c. 45 mph
d. 50 mph

Explanation:

Step1: Recall speed formula

Average speed formula is \( \text{Speed} = \frac{\text{Distance}}{\text{Time}} \).

Step2: Substitute values

Distance = 405 miles, Time = 9 hours. So \( \text{Speed} = \frac{405}{9} \).

Step3: Calculate division

\( \frac{405}{9} = 45 \).

Answer:

c. 45 mph