Final answer:
The unit rate for Kim and Ben planting flowers is 11 flowers per hour.
Step-by-step explanation:
The unit rate can be calculated by dividing the number of flowers planted by the number of hours it took to plant them. For Kim, the unit rate is 24 flowers / 2 hours = 12 flowers per hour. For Ben, the unit rate is 33 flowers / 3 hours = 11 flowers per hour. So, the unit rate for both of them is 11 flowers per hour.