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Certain quantity of water cools from 70^...

Certain quantity of water cools from `70^@C` to `60^@C` in the first 5 minutes and to `54^@C` in the next 5 minutes. The temperature of the surroundings is

A

`45^@C`

B

`20^@C`

C

`42^@C`

D

`10^@C`.

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