1. The problem statement, all variables and given/known data I have attached the question. I'm not really sure how to do this one 2. Relevant equations power = work done/time 3. The attempt at a solution Is the turbine efficiency simply the power generation (750kW) divided by the mechanical output (800kW) which is so 750/800 x 100 = 93.75% efficiency? and then there's the combined turbine generator efficiency. How do you do that?