Given that the machine takes 80 minutes to produce 100 gallons of ice cream, so the rate of production (r) is given by,
So the time required to produce 1200 gallons of the ice cream is calculated as,
Thus, 960 minutes are required for producing 1200 gallons of ice cream.
Converting into hours,
The time 16 hours after 6:00 am will be 22:00 which corresponds to 10:00 pm.
Therefore, the product run will end at 10:00 pm.