Yolanda reads 7 1/2 chapters in 3 1/8 hours. What is the unit rate in chapters per hour? Write your answer as a fraction or a mixed number in simplest form.

Why can't my rank go i have 1723 points, but my rank is only at ambitious, which is only 250 points! like, (p.s. i know this isn't related to math, but i just don't know why it's doing this and i would really appreciate if someone could tell me whats going on with this)