The following table shows the probabilities for rolling a certain number with a two-dice roll. If you want the probabilities of rolling a set of numbers (e.g. a 4 and 7, or 5 and 6), add the probabilities from the table together. For example, if you wanted to know the probability of rolling a 4, or a 7:
3/36 + 6/36 = 9/36.
She can read 55 pages per hour
So, divide that by 2 to get 27.5
She can read 27.5 pages in the next 30 Min.
(She would be on page 137.5 :p)
Hope this helps!!