Chasing a point

Problem by zainul abidin
30 Nov 1999 00:00 WIB1 answer
Point A moves uniformly with velocity v so that the vector $v$ is continually “aimed” at point B which in its turn moves rectilinearly and uniformly with velocity $u<v$. At the initial moment of time $v \perp u$ and the points are separated by a distance $l$. How soon will the point converge?