A body cools from 80^(@)C to 60^(@)C in ...

A body cools from `80^(@)C to 60^(@)C` in `5` minutes. The temperature of the surrounding is `20^(@)C`. The time it takes to cool from `60^(@)C to 40^(@)C` is :

`(25)/(3)s`

`450s`

`420s`

`500s`

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