A Level is set up midway between two wood hubs that are about 300 ft. apart. The rod reading on hub A is 9.09 ft. and the reading on hub B is 5.65 ft. The level is moved so it is along the side of hub B and about 6 feet away from it. Readings are taken are taken from the new set up with the reading on hub A of 7.11 ft. and on hub B of 3.70 ft. (10 points) (see Section 2.11) a. What is the correct difference in elevation between the hubs A and B