To find the average speed of the airplane flying along the sides of a square, we can use the following approach:
1. **Understand the Path and Speed**: The airplane is flying along the perimeter of a square. Let's denote the side length of the square as \( s \).
2. **Perimeter Calculation**: The perimeter \( P \) of a square with side length \( s \) is given by:
\[
P = 4s
\]
3. **Distance Travelled at Each Speed**: The airplane travels