Eight persons, A through H, were standing along a circular track, not necessarily in the same order, such that the distance along the track between any two persons standing adjacent to each other was exactly 1 km. At exactly 9:00 AM, all of them started riding along the track in the clockwise direction. However, four of them started riding at a speed of 1 km/h, while the other four started riding at a speed of 3 km/h.
The following information is known about their relative positions along the track at exactly 10:00 AM, as they were riding: No two persons were at the same position. G was immediately behind D, while E was diametrically opposite C. B was not immediately behind H, while F was diametrically opposite A. The following information is known about their relative positions along the track at exactly 11:00 AM, as they were riding: Neither F nor B was either immediately ahead of or immediately behind H. E was either immediately ahead of or immediately behind D.
PS: It can be solved completely. Find the arrangement at 9 AM,10 AM and 11 AM ?