In a B.G. railway track, the specified ruling gradent is 1 in 250. The horizontal curve of $3^{o}$ on a gradient of 1 in 250 will have the permissible gradient of

- 1
  
  1 in 257
- 2
  
  1 in 357
- 3
  
  1 in 457
- 4
  
  1 in 512

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