11. RECIPROCAL LEVELING. In reciprocal leveling across a deep ravine the following sets of od readings were taken: Instr Near A: BS on A=1.719 m, Average FS on B=2.578 m Instr Near B: Average BS on A=1.335 m, FS on B=2.176m Point A is on one side of the ravine and has a known elevation of 197.428 m. Point B is on the other side. Determine the elevation of point B.