AMC 8 2007 Problem 14

The base of isosceles $\triangle ABC$ is $24$ and its area is $60$. What is the length of one of the congruent sides? $\mathrm{(A)}\ 5 \mathrm{(B)}\ 8 \mathrm{(C)}\ 13 \mathrm{(D)}\ 14 \mathrm{(E)}\ 18$