A heat engine operates between a cold reservoir at temperature ${T}_{2}=400\, {K}$ and a hot reservoir at temperature ${T}_{1} .$ It takes $300 \,{J}$ of heat from the hot reservoir and delivers $240\, {J}$ of heat to the cold reservoir in a cycle. The minimum temperature of the hot reservoir has to be $....{K}$
JEE MAIN 2021, Medium
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