On the plane xy, there are four points; O (0,0), A (0,3), B(0,-3) , C(4,0).

When point D is the intersection of bisector of $\displaystyle \angle $ ABC and x-axis, then

OD : DC = ____: _____ and the coordinates of the inner center of $\displaystyle \triangle ABC$ are .....

somebody has a tip?

Answer: 3:5

(3/2;0)