The Solution:
Given that the distance is defined by the function below:

We are required to find the average speed of the ladybug from t=1 second to t=3 seconds in inches/second.
Step 1:
For t=1 second, the distance in inches is

For t=3 seconds, the distance in inches is

By formula,

In this case,
Distance covered = change in distance, which is

Time taken = change in time, which is:

Substituting these values in the formula, we get

Therefore, the correct answer is 11 inches/second.