Let  $\overline{\mathrm{a}}=\overline{\mathrm{i}}+2\overline{\mathrm{j}}+3\overline{\mathrm{k}},$ $\overline{\mathrm{b}}=\overline{\mathrm{i}}-\overline{\mathrm{j}}+2\overline{\mathrm{k}}$  and  $\overline{\mathrm{c}}=5\overline{\mathrm{i}}-3\overline{\mathrm{j}}+3\overline{\mathrm{k}}$  be three vectors. If $\overline{\mathrm{r}}$  is a vector such that, $\overline{r}\times \overline{b}=\overline{c}\times \overline{b}$ and  $\overline{\mathrm{r}}.\overline{\mathrm{a}}=0$ , then $25{\left|\overline{\mathrm{r}}\right|}^2$  is equal to