The parabola is 1600 meters wide. Since a parabola is symmetrical it extends 800 meters to right and left. At 800 meters to the right or left, the height is 60 meters.
So, the parabola must be
y = kx^2
60 = k(800^2)
k = 60/640,000 = 6/64,000 = 3/32000
y = 3/32000x^2
Then, at 400 meters, the height of the cables is found using that equation:
y = 3/32000(400)^2 = 15 meters
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