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A certain freezing process requires that room temperature be lowered from $40^{\circ}\ C$ at the rate of $5^{\circ}\ C$ every hour. What will be the room temperature 10 hours after the process begins?
Given :
Initial Room temperature $= 40^o\ C$.
Rate of decrease of temperature $=5^o\ C$ per hour.
To do:
We have to find the room temperature after 10 hours.
Solution :
Temperature decreased in 1 hour $= 5^o\ C$
Temperature decreased in 10 hours $= 10 \times 5^o\ C$
$= 50^o\ C$
Therefore,
The temperature of the room after 10 hours $=$ Initial temperature $-$ Decrease in temperature
$= 40^o\ C - 50^o\ C$
$= -(50-40)^o\ C$
$= -10^o\ C$.
Therefore, the room temperature after 10 hours will be $-10^o\ C$.
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