A tree casts a shadow $24\; m$ long and cosin of the angle of elevation from the tip of the shadow to the top of the tree is $\dfrac{4}{5}$, what is the height of the tree ?

Question

$\begin{array}{1 1} (a)\;15\;m\\ (b)\;18\;cm \\ (c)\;20\;m \\ (d)\;25\;m \end{array} $