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How much time (in minutes) will a liquid...

How much time (in minutes) will a liquid take to cool from `46^(@)C` to `44^(@)C` if it takes 5 minutes to cool from `66^(@)C` to `64^(@)C`.The temperature of surrounding is `20^(@)C`

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Verified by Experts

The correct Answer is:
`09.00`
`-(dT)/(dt)=k(T-T_(0))`
`2/5=kxx45`
`2/5=kxx25`
`2/(25xxt)=2/225`
`t=9` minutes
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