The temperature of an experimental heated enclosure is being ramped up from 80 to 450F at the rate of 13F/min. A thermocouple, embedded in a Thermowell for protection, is being used to monitor the oven temperature. The thermocouple has a time constant of 64 s. At t = 10 min, what is the difference between the actual temperature and the temperature indicated by the thermocouple?