A car travles a distance `A` to `B` at a speed of `40km//h` and returns to `A` at a speed of `30km//h`.
(i) What is the average speed of the whole journey?
(ii) What is the averege velocity?

Explanation

To solve the problem step by step, we will break it down into two parts: finding the average speed of the whole journey and then finding the average velocity.

### Part (i): Average Speed of the Whole Journey

1. **Define the Distance**:
Let's assume the distance from point A to point B is \( x \) km. Therefore, the total distance for the round trip from A to B and back to A is:
\[
\text{Total Distance} = x + x = 2x \text{ km}
...