A particular substance is being cooled b...

A particular substance is being cooled by a stream of cold air (temperature of the air is constant and is `5^(@)C`) where rate of cooling is directly proportional to square of difference of temperature of the substance and the air.
If the substance is cooled from `40^(@)C` to `30^(@)C` in 15 min and temperature after 1 hour is `T^(@)C,` then find the value of `[T]//2,` where [.] represents the greatest integer function.

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