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A vessel full of hot water is kept in a ...

A vessel full of hot water is kept in a room and it cools from `80^(@)C` to `75^(@)C` in `T_(1)` minutes, from `75^(@)C` to `70^(@)C` in `T_(2)` minutes and from `70^(@)C` to `65^(@)C` in `T_(3)` minutes Then .

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