Line Plots · Medium problem

A line plot shows the lengths of crayon pieces, in inches. Above $\dfrac{1}{4}$ there are $5$ X's and above $\dfrac{3}{4}$ there are $3$ X's. Put all the $\dfrac{3}{4}$-inch pieces in one row and all the $\dfrac{1}{4}$-inch pieces in another row. How many inches longer is the row of $\dfrac{3}{4}$-inch pieces?