Answer: 21 feet in 18 minutes and 28 feet in 24 minutes.
Explanation:
We will find the unit rate. We are looking for the distance in one minute, so we will divide the total distance by the total time.

Next, we will multiply this by the given times to find the distances it crawls.
18 minutes * 1.167 ft/minute ≈ 21 feet
24 minutes * 1.167 ft/minute ≈ 28 feet