To find out how many pages Brian can read in 3.5 hours, we first determine his reading rate.
Brian reads 80 pages in 2 hours, so his reading rate is:
\[ \text{Reading Rate} = \frac{80 \text{ pages}}{2 \text{ hours}} = 40 \text{ pages per hour} \]
Now, to find out how many pages he can read in 3.5 hours, we multiply his reading rate by the number of hours:
\[ \text{Pages in 3.5 hours} = 40 \text{ pages/hour} \times 3.5 \text{ hours} = 140 \text{ pages} \]
So, Brian can read 140 pages in 3.5 hours. The correct response is:
140 pages
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