To find out how many boxes Gerry can pack in one hour, we need to determine his rate of packing.
Gerry takes \( \frac{24}{3} = 8 \) hours to pack 4 boxes.
Now, we calculate the rate of packing:
\[ \text{Rate} = \frac{\text{Number of Boxes}}{\text{Time in Hours}} = \frac{4 \text{ boxes}}{8 \text{ hours}} = 0.5 \text{ boxes per hour} \]
Therefore, Gerry can pack 0.5 boxes of dishes in 1 hour.