190 quarts in 2 hours is 95 quarts (half as much) in 1 hour. In 24 hours that's 24*95 or 12*190=2,280 quarts. In 48 hours we have twice as much: 4,560 quarts. If the factory works all day it makes 2,280 quarts a day, that's the rate per day. There are 4 quarts in a gallon, so 2,280 quarts a day is 2280/4=570 gallons a day.