Electric potential: definition

A positive charge, $Q$‍, is located at point $\text{O}$‍.

The electrostatic force due to $Q$‍, slowly pulls a point charge (no acceleration), $q=-1.5\text{C}$‍, from point $\text{B}$‍ to point $\text{A}$‍, doing $3\text{J}$‍ of work.

What is the potential difference, ${\text{V}}_{\text{B}}-{\text{V}}_{\text{A}}$‍, or, ${\text{V}}_{\text{BA}}$‍?