Question Five (28 marks): Point A, at an elevation of 2550m, is the entrance of a mine tunnel which bears N 60 E on a downward grade of 30%. A second tunnel entrance is located at point B, which is 50m south and 60m east of A, and 50m below A. This second tunnel bears N 45 E on an upward grade of 35%. Scale 1:1000, vertical and horizontal. Problem: Determine the true length, bearing, and grade of the shortest connecting tunnel. What would be the elevation at both ends of the connecting tunnel?