A light signal is sent from the origin of a system K at t=0 to the point x=3m, y =5m, z = 10m. a) At what time t is the signal received? b) Discover (x’,y’, z’, t’) for the receipt of the signal in a frame K’ that is moving along the x axis of k at a speed of .8c. c) From your results in b) verify that the light travelled with a speed c as gauged in the K’ frame.