A staff was held vertically at a distance of 100m & 300m from the centre of theodolite fitted with stadia hairs and the staff intercepts with the telescope horizontal were 0.990 and 3.00 respectively. The instrument was then set over station A of RL 950.50 m and height of instrument was 1.42 metre . The stadia hair readings of a staff held vertically at station B were 1.00 m , 1.83 metre , and 2.67 m while the vertical angle was -10 degree. Find the distance between A & B and RL of B
