A body at 50^(@)C cools in a surrounding...

A body at `50^(@)C` cools in a surroundings maintained at `30^(@)C`. The temperature at which the rate of cooling is half that of the beginning is

`16.3^(0)C`

`26.3^(0)C`

`40^(0)C`

`46.3^(0)C`

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