Here's the question you clicked on:
Ishaan94
Problem.
|dw:1346780861941:dw| At \(t=0\) B starts chasing A, with velocity \(v\), A's velocity \(u\) is always in the horizontal direction. \(a\). Find the time at which A will catch up to B assuming A's velocity is large enough. \(b\). If \(u = v\) then find the shortest distance between A and B during the motion.
And the initial separation between A and B is \(d\).
I got to go now, I will come back later. Good luck :-)
So...many...variables...
The answer is one link deeper than http://www.physicsforums.com/showthread.php?t=232532, but I couldn't look.
Everything seems to be a function of everything else. Do you have any idea what the 'base unit/variable' here is? If you determine that, the problem (I think) would become easy.