First, divide the total mass of the flour mills by 2.5 hours to find out how many tons of flour are ground by the three flour mills 1 hour, and then divide by the three flour mills to find out how many tons of flour are ground by each flour mill per hour.

Solution: 33.6÷2.5÷3 = 13.44÷3 =4.48 (tons) A: Each flour mill grinds 4.48 tons of flour per hour on average.

Comment on this problem is solved according to the meaning of division and average division. You can also calculate how many tons each mill grinds in 2.5 hours, and then divide it by 2.5 hours. The formula is: 33.6 ÷ 3 ÷ 2.5.