Ok so 7 times 4 is 28 so she read 28 the first day. For the second day since 40-28= 12, 12 divided by 2 is 6. So she read 6 pages per hour.
4hr * (7 pages/hr) = 28 pages
Therefore, Elen must have read the remaining 12 pages on the second day.
Since she took 2 hours to finish the book, she read 6 pages per hour on the second day.
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