A sewer is laid from a manhole A to a manhole B, 250 m apart along a downward gradient of 1 in 125. If the reduced level of the invert at A is 205.75m and the height of the boning rod is 3 m then, reduced level of the sight rail at B is

- 1
  
  202.75 m
- 2
  
  206.75 m
- 3
  
  208.75 m
- 4
  
  211.75 m

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