Civil Engineering Quizzes Railways

Question:
If a 0.7% upgrade meets a 0.65% downgrade at a summit and the permissible rate of change of grade per chain length is 0.10%, the length of the vertical curve, is

Option A):
12 chains
Option B):
14 chains
Option C):
16 chains
Option D):
10 chains

Correct Answer is Option B):
14 chains