Teresa runs 4 miles in 23 minutes. How many minutes does she take per mile?

Mar 4, 2018

$5.75 \text{minutes"/"mile}$

Explanation:

Word problems with phrases like "something in something" are usually ratios. "minutes in miles" is expressed in math as
$\text{minutes"/"miles}$

Now you can see that if you just put the values given into the expression, you will get a result "unified" to the units - $\text{minute"/"mile}$

(23" min")/(4" mile") = 5.75"minutes"/"mile"