This is a problem but its easy!

Let $AC$ be a line segment in the plane and $B$ a point between $A$ and $C$ . Construct isosceles triangles $PAB$ and $QBC$ on one side of the segment $AC$ such that $\angle APB = \angle BQC = 120^\circ$ and an isosceles triangle $RAC$ on the other side of $AC$ such that $\angle ARC = 120^\circ$ . Find $\angle RAP$ .