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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 ?

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Initial temperature = 40°C
Room temperature decreases at 5°C per hour
Temperature change in 1 hour = -5°C
Temperature change in 10 hour = -5 × 10°C = -50°C
Room temperature after 10 hours = Initial temperature + Temperature change in 10 hour
= 40 + (-50)
= 40 – 50
∴ Room temperature after 10 hours = -10°C

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