Steam at 780 K and 3 MPa enters an adiabatic turbine with a flow rate of 300 kg/s and leaves at 0.5 MPa. The turbine produces work at a rate of 105.75 MW. Potential energy and kinetic energy may be neglected. Determine: (a) the exit temperature in unit of K of the steam (b) the isentropic efficiency of the turbine.