If Raya can knit 4 scarves in 2 hours, we can find out how many scarves she can knit in 1 hour by dividing the number of scarves by the time.
In 2 hours, she knits 4 scarves:
\[ \text{Scarves per hour} = \frac{4 \text{ scarves}}{2 \text{ hours}} = 2 \text{ scarves per hour} \]
So, Raya can knit 2 scarves in 1 hour.