we often talk about the speed of sound and the speed of light. sound and light are two different types of waves. what do you think we mean when we talk about the ""speed"" of a wave?

50 meters per 5 seconds

Uncle grandma

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.