Question: A back tangent with a + 7 % grade is connected to a forward tangent with a - 5 % grade by means of a

A back tangent with a +7% grade is connected to a forward tangent with a -5% grade by means of a 350 ft vertical curve. The PVI station is 20+35 and PVI elevation is 250 feet. Find the curve elevation at station 21+35.

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