Answer: 3 miles per hour.
Step-by-step explanation:
Given : Aubrey can walk [tex]4\dfrac{1}{2}[/tex] miles in [tex]1\dfrac{1}{2}[/tex] hours.
We can first convert the mixed fraction into improper fraction.
i.e. Distance = [tex]4\dfrac{1}{2}\text{ miles}=\dfrac{4(2)+1}{2}=\dfrac{9}{2}\text{ miles}[/tex]
Time = [tex]1\dfrac{1}{2}\text{ hours}=\dfrac{2(1)+1}{2}=\dfrac{3}{2}\text{ hours}[/tex]
Now, the average speed in miles per hour =[tex]\dfrac{\text{distance}}{\text{time}}[/tex]
i.e. the average speed in miles per hour =[tex]\dfrac{\dfrac{9}{2}}{\dfrac{3}{2}}[/tex]
i.e. the average speed in miles per hour =[tex]\dfrac{9}{3}[/tex]
i.e. the average speed in miles per hour =[tex]3[/tex]
Hence, her average speed is 3 miles per hour.
