Initially, an insulated rigid tank contains 15.65 kg of water at 24.16oC and 101 kPa. The tank also contains a 3.12 kg copper block at 92.35oC. Assume constant specific heats where Cwater = 4.179 kJ/kg-K and CCu = 0.385 kJ/kg-K. Determine the final equilibrium temperature (K).