Sherlock Holmes & Math

Sherlock Holmes was called on the murder’s scene at 2 am. He took the temperatures of the victim (29 ℃) & room (21 ℃).

One hour later the dead body’s temperature dropped to 27 ℃.
He concluded the murder occurred 2.41 hrs ago at 11:35 p.m.
Why ?
[Assume normal person temp is 37 ℃ ]

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