1.

   A cup of tea cools from \[{{80}^{0}}C\] to \[{{60}^{o}}C\] in one minute. The ambient temperature is \[{{30}^{o}}C\]. In cooling from \[{{60}^{o}}C\] to \[{{50}^{o}}C\] it will take         [MP PMT 1995; UPSEAT 2000;  MH CET 2002]

A.            \[30\ \sec onds\]               
B.            \[60\ \sec onds\]
C.            \[90\ \sec onds\]               
D.            \[50\ \sec onds\]
Answer» E.


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