The teacher's house, Xiaoxue's house and the school are on the same road. The teacher's home is 425 meters away from the school, and Xiaoxue's home is 170 meters away from the school. How many situations may there be in the relationship between the two of them and the school? How far is it from the teacher to the primary school?
老师家，小雪家和学校在同一条路上．老师家到学校有425米，小雪家到学校170米，他们两家和学校的位置关系可能有多少种情况，老师到小学家有多远，请列式解答．
<result>2</result>