1.

According to Newton's law of cooling, the rate of cooling of a body in air is proportional to the difference between the temperature of the body and the temperature of the surrounding air. If the air temperature is 20^(@)C and the body cools for 20 minutes from 140^(@)Cto80^(@)C, then the temperature will be 50^(@)C in

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30 MINUTES
40 minutes
50 minutes
60 minutes

ANSWER :B


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