An overhead line with a span of 300m and in a hilly area with a ground slope of 1 in 20 and having a conductor weight of 0.

An overhead line with a span of 300m and in a hilly area with a ground slope of 1 in 20 and having a conductor weight of 0.8kg/m, is supported between two towers at equal height of 30m above ground level. Assuming the working tension of the line is 1500kg; find the clearance at the lowest point of the conductor (OG) with x1=56.25m.