If the rate of change of grade permitted along a vertical curve ir r and total change of grade is g%, the length L of the curve to be provided, is

- 1
  
  $L = \frac{r \times 100}{g} m$
- 2
  
  $L = \frac{8 \times 100}{r} m$
- 3
  
  L = (r + g) x 100 m
- 4
  
  $L = \frac{100}{r + g} m$

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