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.

Explanation:

Given : Aubrey can walk
`4(1)/(2)` miles in
`1(1)/(2)` hours.

We can first convert the mixed fraction into improper fraction.

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

Time =
`1(1)/(2)\text{ hours}=(2(1)+1)/(2)=(3)/(2)\text{ hours}`

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

i.e. the average speed in miles per hour =
`((9)/(2))/((3)/(2))`

i.e. the average speed in miles per hour =
`(9)/(3)`

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

Hence, her average speed is 3 miles per hour.