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

Step-by-step explanation:

Given : Christy drove 132 miles in $2\dfrac{3}{4}$ hours.

We can first convert the mixed fraction into improper fraction.

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

$\dfrac{8+3}{4}\text{ hours}=\dfrac{11}{4}\text{ hours}$

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

i.e. the average speed in miles per hour =$\dfrac{132}{\dfrac{11}{4}}}$

i.e.  the average speed in miles per hour =$\dfrac{132\times4}{11}$

i.e.  the average speed in miles per hour =$12\times4=48$

Hence, her average speed is 48 miles per hour.