Question: 81. A 4.0% grade and a +2.0% grade meet between Stations 60+00 and 70+00. An 800-ft-long, equal tangent, vertical curve will join the two grades.

81. A 4.0% grade and a +2.0% grade meet between Stations 60+00 and 70+00. An 800-ft-long, equal tangent, vertical curve will join the two grades. 60+00 1,166 00 4.0 70+00 1,159 00 +2.0 The vertical distance in feet (external of the curve) from the PVI to the midpoint of the curve is most nearly: (A) 3.00 (B) 4.00 (C) 5.00 (D) 6.00

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