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UPSC Civil Service Exam Questions - Engineering

Q1:

An ascending gradient of 1 in 100 meets a descending gradient of 1 in 50, The length of summit curve required to provide overtaking sight distance of 500 m will be

A 938 m

B 781m

C 470 m

D 170 m

ANS:B - 781m

1/100 + 1/50 = 3/100.
Then,

OSD 3/100/9.6 = 781.