cubic edge-transitive graphs of order 40p

A simple graph is called semisymmetric if it is regular and edge-transitive but not vertex-transitive. ##let p be a prime. folkman in [1] proved that a regular edge-transitive graph of order 2p or 2p^2, necessarily vertex-transitive. ##we prove that if γ is a connected cubic edge-transitive graph of order 40p, p a prime, then either is semisymmetric for, p = 3 and γ is isomorphic to the cubic semisymmetric graph of order 120 in [2] or p = 31 and γ is isomorphic to c(l2(31); s4, s4). and for p is opposite to 3 and 31 1ts vertex-transitive.