Two hill tops A and B 20 km apart are intervened by a third top C. If the top most contour of the three hill tops are of the same value, state whether the line of sight AB

In this scenario, since all three hilltops have the same contour value, it implies they are at the same elevation. If the line of sight AB passes clear of hilltop C, it means the line AB does not intersect the contour line of hilltop C, indicating that the line AB is at a higher elevation compared to hilltop C.