Question

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?

Answer 1

Find the temperature change in 10 hours:

1 hour = 5ºC

10 hours = 5 x 10 = 50ºC

Find the temperature after 10 hours:

Initial temperature = 40ºC

Final temperature = 40 - 50 = - 10ºC

Answer: The temperature will be -10ºC

Answer 2

Given:

A certain freezing process requires that room temperature be lowered from 40°C at the rate of 5°C every hour$.$

To find:

What will be the room temperature 10 hours after the process begins?

STEP BY STEP EXPLANATION:

Initial temperature 40°C

Change in temperature per hour = -5°C

Change in temperature after 10 hours = (-5) x 10 = -50°C

Final temperature = 40°C + (-50°C) = -10°C

∴ the room temperature will be -10°C after 10 hours

Hence verified !