Final answer:
The equivalent rate of 18 inches/second is 1.5 feet per second.
Step-by-step explanation:
To convert inches to feet, we divide the number of inches by 12 because there are 12 inches in a foot. So, to convert 18 inches to feet, we divide 18 by 12 which equals 1.5 feet. Therefore, the equivalent rate of 18 inches/second is 1.5 feet per second.
Learn more about converting inches to feet