The following liquid phase reaction takes place in a CSTR whose volume is $V.$

$AB,-r_A=k{C}_A$

The feed to the reactor has $v_0=5d\frac{m^3}{m}in$ and $C_{A0}=2mo\frac{l}{d}{m}^3.$ Running the reactor at $325K$ and $350K$ results in conversion $x=0\mathrm{.}7$ and $0\mathrm{.}75,$ respectively. Determine the ratio of $\frac{k(350K)}{k(325K)}.$