Problem 1 Three hills A, B and C has elevations D, E, and F of respectively. B is in between A and C and is 11 km from A and 13 km from C SET A D=650m, E-615m and F =590m SET B D=660m, E=625m and F =595m Required: 1. Considering the effect of curvature and refraction correction what is the clearance or obstruction of the line of sight at B considering that C is visible from A. 2. If a 6m tower is erected on top of B, what would be the height of equal towers to be erected at A and C in order that A, B and C will be intervisible 3. What should be the height of tower to be erected at C so that B and C will be intervisible from A