The chase

Car A leaves a point at $14\ \text{m/s}$. Car B leaves the same point $9\ \text{s}$ later at $21\ \text{m/s}$, the same way. You will make the program find A's head start when B leaves, how long B takes to catch A, and how far from the start they meet. Then it draws both cars' positions against time.

The idea. The head start is the distance A covers before B starts. B closes it at the difference of the speeds.

Your tasks.

1. Find head_start, the distance between the cars when B starts, in metres.
2. Find t_catch, the time from B's start until it catches A, in seconds.
3. Find x_meet, the distance from the start where they meet, in metres.