calculateAverageSpeed()

Step 1: Understanding the Problem

The first step in approaching this problem would be understanding the context of the problem. We want to measure the average speed. And as we know, average speed is obtained by the total distance travelled divided by the total time taken to travel that distance.

Step 2: Initialize the Function and Parameters

Next, we initialize our function and parameters. Our function calculateAverageSpeed will take two parameters: distance which would represent the total distance travelled and time which would represent the total time taken to travel that distance. Below is the code snippet:

public static float calculateAverageSpeed(float distance, float time) {
}``` 

## Step 3: Implementing the calculation 

Inside our function, we go ahead to perform the calculation for the average speed. This is done by dividing distance over time and storing the result in a variable. We have: 

```java 
public static float calculateAverageSpeed(float distance, float time) {
    float averageSpeed = distance / time;
}``` 

## Step 4: Returning the result 

Next, we should remember to return the result calculated. This would be the output of our function whenever it is called. So we add a return statement to our function implementation. 

```java 
public static float calculateAverageSpeed(float distance, float time) {
    float averageSpeed = distance / time;
    return averageSpeed;
}``` 

## Step 5: Conclusion 

At this point, the calculateAverageSpeed function is complete. The function takes in two parameters, performs a calculation with them, and returns the result. Below is the full code 

```java 
public class Main {
    public static void main(String[] args) {
        System.out.println(calculateAverageSpeed(100, 5));
    }
    public static float calculateAverageSpeed(float distance, float time) {
        float averageSpeed = distance / time;
        return averageSpeed;
    }
}```}