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UPSC Civil Service Exam Questions - Engineering

Q1:

A summit vertical curve is to be set joining + 2 percent grade with -3 percent grade. If the tangents interest at an elevation of 60 m and the rate of change of grade is - 1 percent per 100 m, then the elevation of the beginning point of the vertical curve will be

A 58.5 m

B 57.5 m

C 55.0 m

D 52.5 m

ANS:C - 55.0 m

Explain the answer, please.