A descending grade of 4.2% intersects an ascending grade of 3% at Station 12+325 at elevation 17.30 m. These two grades are to be connected by a 260-m vertical parabolic curve. A reinforced concrete culvert pipe with overall diameter of 105 cm is to be constructed with its top 30 cm below the subgrade. What will be the invert elevation? 18.863 m 17.634 m 18.225 m 19.214 m

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A:

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.