It is known that oranges can be exposed to freezing temperatures for short periods of time without sustaining serious damage. As a representative case, consider a 0.10-m-diameter orange, originally at a uniform temperature of 5°C, suddenly exposed to surrounding air at -5°C. For a surface coefficient, between the air and orange surface, of 15 W/m² · K, how long will it take for the surface of the orange to reach 0°C? Properties of the orange are the following:

ρ = 940 kg/m³
K = 0.47 W/m · K
c_p = 3.8 kJ/kg · K