Greatest common factor of 30 and 40 explained please help!

Could answer every question with steps

Shryia read a 481 -page-long book cover to cover in a single session, at a constant rate. after reading for 1.5 hours, she had 403 pages left to read. how fast was shryia reading? pages per hour how long did it take her to read the entire book? hours plz i realy need this

Polynomial that can be factored as (3x-4)(3x+4)