Let $\overline{\mathrm{a}}=\overline{\mathrm{i}}+\overline{\mathrm{j}}, \overline{\mathrm{b}}=2\overline{\mathrm{i}}-\overline{\mathrm{k}}.$ Then the point of intersection of the lines $\overline{\mathrm{r}}\times \overline{\mathrm{a}}=\overline{\mathrm{b}}\times \overline{\mathrm{a}}$ and $\overline{\mathrm{r}}\times \overline{\mathrm{b}}=\overline{\mathrm{a}}\times \overline{\mathrm{b}}$ is

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