The distance of the point having position vector $-\hat{\mathrm{i}}+2\hat{\mathrm{j}}+6\hat{\mathrm{k}}$ from the straight line passing through the point (2, 3, – 4) and parallel to the vector, $6\hat{\mathrm{i}}+3\hat{\mathrm{j}}-4\hat{\mathrm{k}}$ is