# 6. 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?

Given,
Initial temperature = $40^{\circ}C$

Also,

Change in temperature per hour = $-5^{\circ}C$

Therefore,Change in temperature after 10 hours = $(-5)\times10 = -50^{\circ}C$

Hence,

Final temperature = $40^{\circ}C + (-50^{\circ}C) = -10^{\circ}C$

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