The top surface of the passenger car of a train moving at a velocity of 65 km/hr is 2.8m wide and 8m long. The top surface is absorbing solar radiation at a rate of 180W/m2 and the temperature of ambient air is 27C. Assuming the roof of the car is perfectly insulated and the radiation heat exchange with the surroundings to be small relative to convection; determine the equilibrium temperature of the top surface of the car.