The total length of a valley formed by two gradients -3% and +2% curve between the two tangent points to provide a rate of change of centrifugal accelaration $0.6 m / s e c^{2}$ , for a design speed 100 kp/ph, is

- 1
  
  16.0 m
- 2
  
  42.3 m
- 3
  
  84.6 m
- 4
  
  none of these

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