A thermometer reading 72 degrees Fahrenheit is placed in a refrigerator where the temperature is a constant 38 degrees Fahrenheit. a) If the thermometer reads 60 degrees Fahrenheit after 2 minutes, what will it read after 7 minutes

b)How long will it take before the thermometer reads 39 degrees Fahrenheit

c) Determine the time that must elapse before the thermometer reads 45 degrees Fahrenheit
Use this formula, kt=ln(T-S)/(To-S)
To=Initial Temp
T=Final Temp
S=Environmental Temperature
t=Time passed
k=constant ​