A Carnot engine takes in heat from a reservoir at 350 oC and has an efficiency of

Question:

A Carnot engine takes in heat from a reservoir at 350 oC and has an efficiency of 35%. The exhaust temperature is not changed and the efficiency is increased to 40%,
(a) The temperature of the hot reservoir is (1) lower than (2) equal to, (3) higher than 350 oC. Explain.
(b) What is the new Celsius temperature of the hot reservoir?