We know that she runs 8 miles in 3 hours and we have to find how much time it takes to run 3 miles.
Let time be x and now lets put in the numeric form.
\(\frac{8}{3}\) = \(\frac{3}{x}\)
now cross multiplying each other so we get
8 x = 3 3
8x = 9 { dividing both sides by 8 }
x = 9/8
or
x = 1.125 hrs.