Two carnot engines operate in a series. Engine 2 uses the waste heat from engine 1. Engine 1 receives 200KJ at a temperature of 420C from a solar energy source, while engine B rejects heat to the atmosphere at a temperature of 4C. If the work output of the engine 1 is twice more than that of engine 2, determine a. the intermediate temperature b. the heat rejected to the cold sink c. the efficiency of each heat engine.