The maximum distance of the apex of a vertical curve of length L from the point of intersection of two grades $+ g_{1} %, a n d - g_{2 %} (g_{1} > g_{2}),$ is

- 1
  
  $\frac{L (g_{1} - g_{2})}{400}$
- 2
  
  $\frac{L (g_{1} - g_{2})}{800}$
- 3
  
  $\frac{L (g_{1} + g_{2})}{800}$
- 4
  
  $\frac{L (g_{2} - g_{1})}{300}$

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