Certain quantity of water cools from 70 
to 60 
in the first 5 minutes and to 54 
in the next 5 minutes. The temperature of the surroundings is;
A
45 
B
20 
C
42 
D
10 
Text Solution
Verified by ExpertsThe correct answer is:
A
Let 
be the temperature of the surroundings.
According to Newton's law of cooling
For first 5 minutes,
For next 5 minutes,
Divide eqn. (i) by eqn. (ii), we get
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