3554. 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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