→AB=3ˆi−ˆj+ˆkand→CD=−3ˆi+2ˆj+4ˆk are two vectors. The position vectors of the points A and C are 6ˆi+7ˆj+4ˆkand−9ˆj+2ˆk, respectively.Find the position vector of a point P on the line AB and a point Q on the line CD such that →PQ is perpendicular to →ABand→CD both.