Protons and Positrons

Two positrons ( $e^+$ ) and two protons ( $p$ ) are kept on the four corners of a square of side a as shown.Mass of proton is much larger than positron.Let $q$ denote the charge on the proton as well as the positron.Then the kinetic Energy of one of the positrons will be $K1$ and one of the protons will be $K2$ after a very long time.Find $\frac{K1}{K2}$ .