Interview Guides
Given two vehicles moving in a 2D plane, each represented by two consecutive positions: (x1, y1) at time t1 and (x2, y2) at time t2, compute the relative velocity vector of the merging vehicle with respect to the ego vehicle. Return [rvx, rvy, speed], where rvx and rvy are the relative velocity components and speed is the magnitude of that relative velocity.
dt > 0-10^6 <= x, y <= 10^6