Joe measures the resolving power of his eye using two small black squares on a note card. There is a 1 mm white space between these squares. Joe backs up, and at a distance of 3.40 meters, the two squares have just appeared to merge together. In other words, he can no longer resolve them as separate objects. Later that day, he is walking home down the middle of a long, straight stretch of railroad track. Off in the far distance, the parallel tracks appear to converge at a single point, even though he knows they are 1.435 meters apart. He reflects on the fact that this is how artists create a 3-D effect, using a vanishing point for a perspective drawing. Given his earlier measurement, how far away is the point at which the tracks seem to converge?