A liquid freezes at $7^\circ\text{C}$ and boils at $77^\circ\text{C}$. If values of $K_f$ and $K_b$ of this liquid are $5.6\,\text{K·kg/mol}$ and $2.5\,\text{K·kg/mol}$ respectively, then the ratio of molar latent heat of fusion (in kJ/mol) to molar latent heat of vaporisation (in kJ/mol) for the liquid is -