A certain freezing process requires that room temperature be lowered from 40 �C at the rate of 5 �C every hour. What will be the room temperature 10 hours after the process begins?
It is given in the question that,
Initial temperature = 40oC
Also,
Change in temperature per hour = - 5oC
Therefore,
Change in temperature after 10 hours = (-5) × 10
= - 50oC
Hence,
Final temperature = 40oC + (-50oC)
= - 10oC