The camber provided on a sloping road is 1 in 48. Which one of the following is the ruling gradient

The camber provided on a sloping road is 1 in 48. Which one of the following is the ruling gradient

• A. 1 in 15
• B. 1 in 20
• C. 1 in 24
• D. 1 in 30

 

The correct answer is option D. 1 in 30. Can you explain this answer in the comments?

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