Need help Point Charges

[percy_07]

Points A,B and C are at the corners of an equilateral triangle of side 3 metres. equal positive charges of 2 micro-Coulombs are at A and B respectively. What is the potential at C??

[Doc Al]

Points A,B and C are at the corners of an equilateral triangle of side 3 metres. equal positive charges of 2 micro-Coulombs are at A and B respectively. What is the potential at C??
The potential at a distance "r" from a point charge of Q is given by:
V = \frac{kQ}{r}