Approximately how long has the victim been dead if his body temperature was 60.0°F?

around 8 or 9 or 10 hours.

14 or 15 hours

Explanation:

The equation for approximating temperature after death is

37.5°C - 1.5°C * hours = temperature

37.5 is the standard body temperature in degrees Celsius.

60°F = 15.56°C

Plug this Celsius value into our equation.

37.5° - 1.5° (hours) = 15.56°C

Let's solve for hours.

-1.5*hours = 15.56 - 37.5°C

-1.5*hours = - 21.94°C

1.5*hours = 21.94°C

hours = 21.94°C / 1.5

hours = 14.62 = = 14 or 15 hours.