The point A with coordinates (0,-5,11) lies on the line l1, which has equation

r=6i+19j-k+(lamda)

(i+4-2k)

The point p lies on l1 and is such that OP is perindicular to l1, where O is the origin.

Find the position vectore of point P.

Given that B had coordinates (5,15,1)

Show that the points A, P and B are collinear and find ratio AP:PB

Thanks

Bryn