Points and are fixed at the vertices of an equilateral

QUESTION:

Points and are fixed at the vertices of an equilateral triangle whose edges are long. A point particle that has a charge of is fixed at each of vertices and (a) What is the electric potential at point (Assume the potential is zero very far from all charges.) (b) How much work is required to move a point particle having a charge of from a distance of infinity to point (c) How much additional work is required to move the point particle from point to the midpoint of side