Dual Nature of Radiation and Matter

A photon and an electron, each of 20 eV energy, move in free space. The ratio of linear momentum of the electron p_e to that of the photon p_Ph, i.e. p_e/p_Ph, is: (Take speed of light = 3 x 10^8 ms^-1, charge of electron = -1.6 x 10^-19 C and mass of electron = 9 x 10^-31 kg)