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?

Solution

From the given data we get to know that

Initial temperature = 40°C

Change in temperature per hour = −5°C

Change in temperature after 10 hours = (−5) × 10 = −50°C

Final temperature = 40ºC + (−50ºC) = −10°C

Answer

∴The final room temperature after 10 hours of freezing process == -10oC

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