A container having volume 282.7 cm and total surface area 245 cm is completely filled with milk whose initial temperature is 25C. The continually stirred milk container is suddenly exposed to steam bath at 100C. The overall heat transfer coefficient between steam and milk is 1136 W/mK. The properties of milk are: Specific heat capacity = 3.9 kJ/kg K Thermal conductivity = 0.54 W/m-K Density = 1030 kg/m. Neglecting thermal resistance and heat capacity of container walls, the necessary time required in seconds to heat milk up to the temperature of 85C, will be