A body cools at the rate 0.50^@C's when ...

A body cools at the rate 0.50^@C's when it is at `50^@C` above the surrounding temperature. Its rate of cooling when it is `30^@C` above the same surrounding temperature will be

`0.32^(@C)/s`

`0.36^(@C)/s`

`0.40^(@C)/s`

`0.3^(@C)/s`

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