Question

A certain freezing process requires that room temperature be lowered from 70°C at the rate of 3°C every hour. What will be the room temperature 20 hours after the process begins?
answer it​

Answer 1

Answer:

Room temperature - 40 C

t is also given that the room temperature lowers at the rate of 5° C, After one hour the temperature becomes (40 – 5) = 35° C

After two hours the temperature becomes (35 – 5) = 30° C

Hence after 10 hours the temperature becomes (-10° C)

Answer 2

Answer:

Room temperature ️ is +10 degree Celcius.

According to the question........

A room temperature should be lowered less than 70°C at the rate of -3°C

After 20 hours of the process begins the total temperature decrease is 20×(-3°C)=-60°C

After 20 hours the room temperature would be=total decrease temperature-initial temperature

-60+70= +10°C.

So the room temperature after 20 hours at the rate of -3°C is +10°C