An ascending gradient of 1 in 100 meets a descending gradient of 1 in 50. The length of the summit curve required to provide overtaking sight distance of 500 m will be

An ascending gradient of 1 in 100 meets a descending gradient of 1 in 50. The length of the summit curve required to provide overtaking sight distance of 500 m will be

• A. 938 m
• B. 781 m
• C. 470 m
• D. 170 m

 

The correct answer is option B. 781 m. Can you explain this answer in the comments?

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