$100 \, g$ of ice at $0^{\circ} C$ is mixed with $100 \, g$ of water at $100^{\circ} C$. The final temperature of the mixture is: [Take $L_{f}=3.36 \times 10^{5} \, J \, kg^{-1}$ and $S_{w}=4.2 \times 10^{3} \, J \, kg^{-1} \, K^{-1}$]