Hot combustion gases (approximated as air) enter a gas turbine at 1 MPa and 1500 K at a rate of 0.1 kg/s, and exit at 0.2 MPa and 900K. If heat is lost from the turbine to the surroundings at a rate of 15 kJ/s, calculate the power output from the gas turbine. (Ans. 45 kW).