Let one focus of the hyperbola $H:\frac{{{x^2}}}{{{a^2}}} - \frac{{{y^2}}}{{{b^2}}} = 1$ be at $(\sqrt {10} ,0)$ and the corresponding directrix be $x = \frac{9}{{\sqrt {10} }}$. If $e$ and $l$ respectively are the eccentricity and the length of the latus rectum of H, then $9\left( {{e^2} + l} \right)$ is equal to :