A summit curve is formed at the intersection of a 3% up gradient and a 5% down gradient. To provide a stopping distance of 128 m, the length of the summit curve needed will be

A summit curve is formed at the intersection of a 3% up gradient and a 5% down gradient. To provide a stopping distance of 128 m, the length of the summit curve needed will be 

• A. 271 m
• B. 298 m
• C. 322 m
• D. 340 m

 

The correct answer is option B. 298 m. Can you explain this answer in the comments?

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