at an instant two particles, A and B are separated by 'l' distance. A particle is going north with a uniform velocity of u. and the speed of B is v. initially the velocity vectors are perpendicular. always velocity of B is aimed towards A . find when they converge.(meet) (v>u) 2. Relevant equations I dont know even how to start because the trajectory seems curved and seemed to need some higher math. however I am well aquianited with calculus. but I just dont know how to use it here.