Coronavirus Spread 2

There are $N$ athletes (numbered $1$ through $N$) in a line. For each valid $i$, the $i$-th athlete starts at the position $i$ and his speed is $V_i$, i.e. for any real number $t \ge 0$, the position of the $i$-th athlete at the time $t$ is $i + V_i \cdot t$. Unfortunately, one of the athletes is infected with a virus at the time $t = 0$. This virus only spreads from an infected athlete to anot