Q 1260112915.     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 `8` min. The approximate temperature of surrounding is :

A

`10^o`

B

`15^o`

C

`20^o`

D

`25^o`

HINT

Use `(d theta)/(dt)=k(Delta theta) [theta_w-theta_s]`

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