There are two benchmarks A and C, if the height of point A is known to be 75.100 m, and the point B is 87.490 meters. A point B between benchmarks A and C is equidistant from A and C. Now, if you want to obtain the height of point B by leveling method with the round trip (forward and return leveling) from A to C and from C to A, both via B. The round-trip height difference of HAB is 5.647 m and 5.632 m respectively, while the round-trip height difference of Hac is 6.734 m and 6.781 m. Please find the most probable value of the height difference HAB and the height of point B.