I need assistance with Coulomb's law:

I know that he formula isf=kd2q1q2 but how do I apply it to solve the problem below? How do I find the el. force on each electron? Is there another formula that I should use?

Problem:

1. Two electrons, each with a charge of1.60x10^-19 C, are separated by a distance of1.50x10^-10 m, the typical size of an atom. Calculate the electrostatic force on each electron.