Argon gas enters an adiabatic turbine at 1300F and 200 psia at a rate of 40 lbm/min

Question:

Argon gas enters an adiabatic turbine at 1300°F and 200 psia at a rate of 40 lbm/min and exhausts at 20 psia. If the power output of the turbine is 105 hp, determine
(a) The isentropic efficiency and
(b) The second-law efficiency of the turbine.
Assume the surroundings to be at 77°F.