It is equivalent to chasing questions, which is equivalent to mother's speed of 250 meters and Xiao Xin's speed of 50 meters. Mother started 20 minutes late and both sides arrived at the same time.

Suppose: the distance between Xiao Xin's home and school is x meters.

x/50=x/250+20

X= 1250 (m)

1250 ÷ 50 = 25 minutes.

The distance between Xiao Xin's home and school is1250m. Xiao Xin needs 25 minutes to go to school in the morning.