If an up grade of +1% on first class railway is followed by a down grade of -2%, then the length of vertical curve will be
A. 20 chains
B. 40 chains
C. 50 chains
D. 80 chains
Answer:C
If an up grade of +1% on first class railway is followed by a down grade of -2%, then the length of vertical curve will be
A. 20 chains B. 40 chains C. 50 chains D. 80 chains