1.

A body cools in 7 minutes from \[{{60}^{o}}C\] to \[{{40}^{o}}C\] What time (in minutes) does it take to cool from \[{{40}^{o}}C\] to \[{{28}^{o}}C\] if the surrounding temperature is \[{{10}^{o}}C\]? Assume Newton?s Law of cooling holds                                                           [Kerala (Engg.) 2001]

A.            3.5
B.            11
C.            7    
D.            10
Answer» D.            10


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