You can put this solution on YOUR website! Simply set up the equation where 'x' is the number of miles she runs in 72 minutes. Notice how the ratio of 4 to 30 is equal to the ratio of x to 72.
Start with the given ratio
Multiply both sides by 72
Multiply
Reduce.
So our answer is which in decimal form is which means that she can run 9.6 miles in 72 minutes.