In the figure $PT$ and $QT$ are the equal tangents of the circle with center $O$. The length $OT$ is twice that of the radius. What is the length of the tangents if the radius is 5 units ?

Question

$\begin{array}{1 1} (a)\; 10\sqrt{3} \\ (b)\; 5\sqrt{3} \\ (c)\; \frac{5}{\sqrt{3}} \\ (d)\; \frac{10}{\sqrt{3}} \end{array}$