Sight Distance of Vertical Parabolic Curve

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Sight Distance of Vertical Parabolic Curve

I need help to this problem I wonder if the answers are in the following choices. The problem is.. A vertical parabolic curve, 135 m long has a tangent grades of -1.7% and 2.3% . Find the sight distance in m.
a. 139.6 c. 147.1
b. 149.8 d. 140.6

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