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If an ascending gradient of 1 in 50 meets a descending gradient of 1 in 50, the length of summit curve for a stopping sight distance of 80 m will be_______________?

If an ascending gradient of 1 in 50 meets a descending gradient of 1 in 50, the length of summit curve for a stopg sight distance of 80 m will be_______________?

A. zero
B. 64m
C. 80m
D. 60m