We were assigned a problem in class, but because it was on guest lecturer material, I am unclear of which given numbers and what equations to use. I do know I am supposed to use: η=TH-Tc/TH But I am confused as to why I have been given 4 variables ...Please Help! Here is the question  You are building a 3000 MW (thermal; i.e., the amount of heat the reactor makes) nuclear plant in India on a river in the foothills of the Himalayas with water temperature a constant 40°F (due to snow melt). After the river water is used in the plant condenser, it is returned at a temperature of 80°F. Assuming this plant operates at 80% carnot efficiency, what is the electric output at full power? Assume that the steam is 540°F and the condenser is at an average of 60°F.