i have been trying to solve this problem for 2 hours...couldn't get anywhere.

"consider 2 points located at r1 and r2, seperated by a distancer=|r1-r2|

find a vector A from origin to a point on the line between r1 and r2 at a distancexrfrom the point at r1, wherexis some number."

i tried to find an equation for the linerand then tried to solve it with vector A...to find the intersection point...but couldn't get anywhere.

HELP!!