The ratio of surface tensions of mercury and water is given to be 7.5 while the ratio of their densities is 13.6. Their contact angles with glass are 135°C and 0°C respectively. It is observed that mercury gets depressed by an amount h in a capillary tube of radius ${\mathrm{r}}_1$ while water rises by the same amount h is a capillary tube of radius ${\mathrm{r}}_2$. Then $\frac{{\mathrm{r}}_1}{{\mathrm{r}}_2}$ is