The vessel has received a refrigerated container loaded with 9 long tons of ice cream. The current box temperature is 31°F but has a normal set point of minus 10°F. Under ideal conditions how long will it take to pull the box temperature down to set point, if the equipment is operating properly? [Specific heat of the cargo equals 0.39 BTU/LB/°F, with a container heat gain of 6,000 BTU/hr, and a refrigeration system capacity of 3.5 tons]
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