Lili walked 42 cm at a time. He walked 596 steps from school to the library. The school is about 250 meters away from the library.

By multiplication, 42 cm times 596 steps equals 25032 cm, which is about 250 meters, so the school is about 250 meters away from the library.

This is a question of distance, which can be calculated by multiplying the distance of one step by the number of steps.