A body takes 4 min. to cool from 61 0 C to 59 0 C. If the temperature of the surroundings is 30 0 C, the time taken by the body to cool from 51 0 C to 49 0 C is:
Text Solution
Verified by ExpertsThe correct answer is:
D
average temp.
= surrounding temp
... (1)
... (2)
Divide (1) & (2) 
so, t=6 minutes
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