If a descending gradient of 1 in 25 meets an ascending gradient of 1 in 40 m, then the length of the valley curve required for a headlight sight distance of 100 m will be
- A. 30 m
- B. 130 m
- C. 470 m
- D. 170 m
The correct answer is option B. 130 m. Can you explain this answer in the comments?
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