Question

Aubrey can walk 4 1/2 miles in 1 1/2 hours. Find her average speed in miles per hour.

Answer 1

Time = 11/2 = 5 1/2
Road = 4 1/2 miles
Speed = 5 1/2 : 4 1/2 = 1 2/9 <------------answer

Answer 2

Answer: 3 miles per hour.

Step-by-step explanation:

Given : Aubrey can walk $4\dfrac{1}{2}$ miles in $1\dfrac{1}{2}$ hours.

We can first convert the mixed fraction into improper fraction.

i.e. Distance =  $4\dfrac{1}{2}\text{ miles}=\dfrac{4(2)+1}{2}=\dfrac{9}{2}\text{ miles}$

Time = $1\dfrac{1}{2}\text{ hours}=\dfrac{2(1)+1}{2}=\dfrac{3}{2}\text{ hours}$

Now, the average speed in miles per hour =$\dfrac{\text{distance}}{\text{time}}$

i.e. the average speed in miles per hour =$\dfrac{\dfrac{9}{2}}{\dfrac{3}{2}}$

i.e.  the average speed in miles per hour =$\dfrac{9}{3}$

i.e.  the average speed in miles per hour =$3$

Hence, her average speed is 3 miles per hour.