Answer: He was killed 24.83 hours before the body was found.
Step-by-step explanation:
Since we have given that

Here, T is the temperature of a body t hr after death, T = 82°F
T₀ is the air temperature , T₀ = 67°F
T₁ is the body temperature at the time of death = T₁ = 98.6°F
So, we will substitute all the values in the above equation.

Hence, he was killed 24.83 hours before the body was found.