A Person Has a Thermal Conductivity of 0

Multiple Choice

A person has a thermal conductivity of 0.18 W/m·K between his inner core and his skin with an effective shell thickness of 1.6 cm between his core and skin.If his inner core is at the normal 98.6°F,and his skin has a surface area of 1.62 m²,what will be his rate of loss of thermal energy due to conduction through his skin if his skin temperature is 31.0°C?
​

A) 68 W
B) 123 W
C) 177 W
D) 109 W
E) ​175 W