If there is only one track, and the monk uses it both ways, then there has to be a point along that track where the two (one imaginary) monks would pass. If speed(same uphill as down) rest stops etc were not an option, then the point has to exist at the middle point, but how to prove it
Would it be at midday? It seems to take all the daylight hours to complete the journey. We could imagine two suns rising, travelling, and setting. At what point would they pass?
Methinks the time has come for TGS to post a full and rational explanation.