A bank on an excavation site has a 3 to 1 slope; how many inches per foot will the bank rise?

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Study for the B3/61 Contractor Trade Exam. Boost your success with flashcards and multiple choice questions, each offering hints and explanations. Prepare to ace your test!

Multiple Choice

A bank on an excavation site has a 3 to 1 slope; how many inches per foot will the bank rise?

Explanation:
Slope represents vertical rise per unit of horizontal distance. A 3 to 1 slope means for every 3 units of horizontal distance, the vertical rise is 1 unit. So per one foot (12 inches) of horizontal run, the rise is 12 × (1/3) = 4 inches. Therefore, the bank rises 4 inches per foot. This is the standard interpretation in excavation, where the ratio is horizontal:vertical (3:1), giving a 4-inch rise for each foot of horizontal distance.

Slope represents vertical rise per unit of horizontal distance. A 3 to 1 slope means for every 3 units of horizontal distance, the vertical rise is 1 unit. So per one foot (12 inches) of horizontal run, the rise is 12 × (1/3) = 4 inches. Therefore, the bank rises 4 inches per foot. This is the standard interpretation in excavation, where the ratio is horizontal:vertical (3:1), giving a 4-inch rise for each foot of horizontal distance.

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