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A black body calorimeter filled with hot water cools from `60^(@)C` to `50^(@)C` in `4 min` and `40^(@)C` to `30^(@)C` in `8min`. The approximate temperature of surrounding is :
A. `10^(@)`
B. `15^(@)C`
C. `20^(@)C`
D. `25^(@)C`

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