Question

Laune reads 25 pages in 30 mins.

Answer 1

25 pages           200 pages
------------  =        ------------
30 min                 x min

You could cross multiply or logically look at it like this:
25 * what number = 200
25 * 8 = 200

Since we multiplied the numerator by 8 we must also multiply the denominator by 8.

30 * 8 = 240 minutes

Answer 2

It will take her 240 minutes to read 200 pages. because you do 200/25= 8 and then 8* 30= 240