Question

O UN CD CDCOOpopCDCDCO n gaOa O

Answer 1

Let L and C equal the number of pages that are read by Li Wei and Colleen respectively.

L=90+30h

C=126+24h

They will have read the same number of pages when L=C so we can say:

90+30h=126+24h  subtract 90 from both sides

30h=36+24h  subtract 24h from both sides

6h=36  divide both sides by 6

h=6 hours

So after 6 hours of reading they will both be on the same page.

Answer 2

126+24x=90+30x

x = the number of hours 
then you solve the equation 
The answer is x=6, so after 6 hours they will be on the same page.