Some particle accelerators allow protons (p⁺) and antiprotons (p^-) to circulate at equal speeds in opposite directions in a device called a storage ring. The particle beams cross each other at various points to cause p⁺ + p^- collisions. In one collision, the outcome is p⁺ + p^- → e⁺ + e^- + γ + γ, where γ represents a high-energy gamma-ray photon. The electron and positron are ejected from the collision at 0.9999995c and the gamma-ray photon wavelengths are found to be 1.0 × 10^-6 nm. What were the proton and antiproton speeds, as a fraction of c, prior to the collision?