Well, we have a couple of data, first the total distance is 500km, in 2 seconds he moved an unknown distance and his shots took 1 second to reach Makima. It is impossible to get the individual speed of the movement, nor the individual speed of the shots, but if it is assumed that his movement speed is similar to that of his shots, we could say that he covered 500 km in 3 seconds. that would be like mach ~486