Two tangent circles are inscribed in a right-angled triangle ABC with the side lengths of 15, 20 and 25 units as shown in the figure below. Find the ratio of CQ and smaller circle radius.
1
\(\frac{{5\sqrt {10} }}{2}\)
2
\(\frac{{3\sqrt {10} }}{2}\)
3
\(\frac{{7\sqrt {10} }}{2}\)
4
√10