1. (16 points) After walking one-fifth of the way from home to school, Olya realized she had forgotten her notebook. If she does not go back for it, she will arrive at school 6 minutes before the bell, but if she returns, she will be 2 minutes late. How much time (in minutes) does the journey to school take?
# Answer: 20 min

Solution. The extra $2 / 5$ of the journey takes 8 min. Therefore, the entire journey to school will take 20 min.