|1-12| simlify tthe expression

Which statement about perfect cubes is true

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)