Xiaoming left home at 7.20. Walking to school, walking to a shop 500 meters away from home and buying school supplies took 5 minutes. Coming out of the shop, Xiao Ming found that it would take another 30 minutes to get to school at the original speed. In order to get to school before 8 o'clock, Xiaoming quickened his pace, walking 25 meters more every minute on average than before, and finally he got to school at 7: 55. Let Xiao Ming's average speed from the store to the school is x meters per minute, the distance from the store to the school is 30 meters (Xiao Ming found that it takes 30 minutes to get to the school at the original speed), and the speed from the store to the school is x +25.

Location: Home-500m-Store -30x- School.

Time: 7:20 (5 minutes) 7:55.

Speed: x m/min x+25m/min.

Build time-consuming relationships.

500/x+5+30x/(x+25)=35

50(x+25)+3x^2=3x(x+25)

25x= 1250，x=50

x+25=50+25=75

A: The average speed from the store to the school is 75 meters/minute.