A levelling staff ‘A’ held inclined inward towards the observer at 20° from the vertical axis is at a distance of ‘D’ m, from the axis of tachometer. The staff intercepts observed are 0.90 m, 1.18 m and 1.74 m and the Reduced Level of the station is 143.5 m. Calculate the RL of A and distance ‘D’ (in meters) respectively if the height of instrument is 1.4 m. (Assume anallatic lens is used).