Answer:
12 miles per hour
Step-by-step explanation:
Speed is the ratio of distance travelled to the time used.
The total distance covered = (5 + 13) miles
= 18 miles
The whole journey took 1 hour + 30 minutes = 1.5 hours
Average rate of speed = [tex]\frac{total distance covered}{total time taken}[/tex]
= [tex]\frac{18 miles}{1.5 hours}[/tex]
= 12 miles per hour
Therefore, her average rate of speed is 12 miles per hour.
