If V is the design speed of vehicles in km/hour, the change of radial acceleration in $m e t r e s / s e c^{3}$ , is

- 1
  
  $\frac{65}{70 + V}$
- 2
  
  $\frac{60}{70 + V}$
- 3
  
  $\frac{70}{65 + V}$
- 4
  
  $\frac{70}{60 + V}$

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