If an upgrade of 1-5% is followed by a downgrade of 0.5% and rate of change of grade is 0.2% per 20m chain, then the length of vertical is
A. 100m
B. 200m
C. 300m
D. 400m
Answer:B
If an upgrade of 1-5% is followed by a downgrade of 0.5% and rate of change of grade is 0.2% per 20m chain, then the length of vertical is
A. 100m B. 200m C. 300m D. 400m