Question: a trench for installing a sanitary sewer pipe has level base length of 1 0 ft with side slopes of 1 . 5 : 1

a trench for installing a sanitary sewer pipe has level base length of 10 ft with side slopes of 1.5:1. There are offset stakes on the surface 3 ft from the edges of excavation. What is the distance between stakes if the trench height is 12 feet?

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