Line Plots · Superchallenge problem

On field day, $10$ kids each ran $\dfrac{1}{2}$ mile, $\dfrac{3}{4}$ mile or $1$ mile, and a line plot shows their distances. Together they ran $8$ miles. More kids ran $1$ mile than ran $\dfrac{3}{4}$ mile. What is the fewest number of kids who could have run $\dfrac{1}{2}$ mile?