A hot body is placed in cooler surroundi...

A hot body is placed in cooler surroundings. When the body temperature is `75^(@)C`, the rate of cooling is `4^(@)C//min`. When it is `55^(@)C`, the rate of cooling is `2^(@)C//min`. The temperature of the surroundings is

`20^(@)C`

`25^(@)C`

`30^(@)C`

`35^(@)C`

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