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A body takes 4 minutes to cool from 100^...

A body takes 4 minutes to cool from `100^(@)C` to `70^(@)C`. To cool from `70^(@)C` to `40^(@)C` it will take (room temperture os `15^(@)C`)

A

`7` min

B

`6` min

C

`5` min

D

`4` min

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