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In a murder investigation, the temperature of the corpse was 33°C at 1:30pm and 20°C  2...

In a murder investigation, the temperature of the corpse was 33°C at 1:30pm and 20°C  2 hours later. Normal body temperature is 37°C and the surrounding temperature was 10°C. How long (in hours) before 1:30pm did the murder take place?
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