So, "Ella and three friends" means 4 people in total!
so that means that each of the 4 people run an equal part of 14miles. To find out each part, we have to divide the total distance (14) by the number of people (4):
[tex] \frac{14}{4} =3 \frac{2}{4} =3\frac{1}{2}[/tex]
so each person run 3.5 miles!