Thermodynamics: JEE Main 2025 Physics question

A gun fires a lead bullet of temperature 300 K into a wooden block. The bullet having melting temperature of 600 K penetrates into the block and melts down. If the total heat required for the process is 625 J, then the mass of the bullet is ____ grams. (Latent heat of fusion of lead $=2.5\times10^4\ \mathrm{J\,kg^{-1}}$ and specific heat capacity of lead $=125\ \mathrm{J\,kg^{-1}K^{-1}}$)