Question

Christy drove 132 miles in 2 3/4 hours. what was her average speed in miles per hour

Answer 1

Christy's average mph is 48 because 132 divided by 2.75 = 48

Answer 2

Answer: 48 miles per hour

Explanation:

Given : Christy drove 132 miles in
`2(3)/(4)` hours.

We can first convert the mixed fraction into improper fraction.

i.e. Time =
`2(3)/(4)\text{ hours}=(2(4)+3)/(4)\text{ hours}`

`(8+3)/(4)\text{ hours}=(11)/(4)\text{ hours}`

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

i.e. the average speed in miles per hour =
`(132)/((11)/(4))}`

i.e. the average speed in miles per hour =
`(132*4)/(11)`

i.e. the average speed in miles per hour =
`12*4=48`

Hence, her average speed is 48 miles per hour.