Hot water cools from 60^@C to 50^@C in t...

Hot water cools from `60^@C` to `50^@C` in the first 10 minute and to `42^@C` in the next 10 minute The temperature of the surrounding is

A

`5^@C`

B

`10^@C`

C

`15^@C`

D

`20^@C`

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