Please help with the solution to these problems.

2.4 An engine operating in a cycle draws 2500 J of thermal energy from superheated steam and exhausts 1500 J to the environment. A. How much work is performed? B. What is the ideal efficiency of the engine. 2.5 Ocean thermal energy conversion (OTEC) uses the temperature difference between the land and the ocean floor to drive a heat engine. The pilot plant at Kona, Hawaii operated between 4.C (39.F) on the ocean floor and 30 C (86 F) on land. What was the maximum possible efficiency? (In actuality, the efficiency was much less, of course.)