A two-blade wind turbine is exposed to 60 mile/h wind. Downstream of the propeller the wind speed is

A two-blade wind turbine is exposed to 60 mile/h wind.
Downstream of the propeller the wind speed is 45 mile/h. The propeller has a
diameter of 45 ft. Assume ideal gas and standard condition for air to find a)
the thrust on the wind turbine, b) the power delivered to the wind turbine, c)
the maximum power extracted by the wind turbine, d) the maximum efficiency
obtained from this wind turbine.