At what temperature should the sink be maintained to increase the efficiency by `10%`?

A Carnot's engine operates with an efficiency of 40% with its sink at 27^(@)C . By what amount should the temperature of the source be increased with an aim to increase the efficiency by 10%

A Carnot's engine whose sink is at temperature of 300K has an efficiency of 40% By how much should the temperature of the source be increased so as to increase the efficiency to 60%?

A carnot engine whose heat sink is at 27^(@)C has an efficiency of 40% . By how many degrees should the temperature of source be changed to increase the efficiency by 10% of the original efficiency?

A carnot engine whose heat sink is at 27^(@)C has an efficiency of 40% . By how many degrees should the temperature of source be changed to increase the efficiency by 10% of the original efficiency?

A Carnot engine, whose sink is at 300 K, has an efficiency of 40%. By how much the source temperature should be changed so as to increase the efficiency to 60% ?

The temperature of the sink of a carnot engine is 300 K and its efficiency is 40 %. Find the decrease in temperature of the sink required to increase the efficiency of the engine to 50% keeping temperature of the source to be constant.