A body cools from 50^@C to 49^@C in 5 s....

A body cools from `50^@C` to `49^@C` in 5 s. How long will it take to cool from `40^@C` to `39.5^@C`? Assume the temperature of surroundings to be `30^@C` and Newton's law of cooling to be valid:

2.5 s

10 s

20 s

5 s

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