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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 min and to `54^(@)C` in the next 5 min. The temperature of the surrounding is

A

`45^(@)C`

B

`20^(@)C`

C

`42^(@)C`

D

`10^(@)C`

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