Final answer:
Mariah can read 40 pages in 1 hour at the same rate.
Step-by-step explanation:
Let's determine how many pages Mariah can read in 1 hour at the same rate.
We know that Mariah can read 120 pages in 3 hours, so we can set up a proportion:
3 hours / 120 pages = 1 hour / x pages
To solve for x, we can cross multiply:
3x = 120 * 1
3x = 120
x = 120 / 3
x = 40
Therefore, Mariah can read 40 pages in 1 hour at the same rate.