Question 810551
If she reads 90 pages in 2.5 hours, then she reads

{{{90/2.5}}}pages in an hour.
={{{36}}}pages in an hour.

At the same rate,

She reads 36 pages in 1hr
She will read 225 pages in xhrs

(I really wish I could simplify this, but since there's no visual, I hope you understand)

She will read 225 pages in {{{(225*1)/36}}}hrs

She will read 225 pages in 6.25hrs.