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If an object cools down from 80°C to 60°C in 5 minutes in a surrounding of temperature 20°C.

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If an object cools down from 80°C to 60°C in 5 minutes in a surrounding of temperature 20°C. The time taken to cool from 60°C to 40°C will be (assume Newton’s law of cooling to be valid)

(1) 25/3 minutes

(2) 5 minutes 

(3) 25/4 minutes

(4) 9 minutes

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(1) 25/3 minutes

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