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If ‘D’ is the diameter of tunnel in meters, then the thickness of lining in mm, as per the empirical formula is given by_________________?

/ Tunnel Engineering / By
If ‘D’ is the diameter of tunnel in meters, then the thickness of lining in mm, as per the empirical formula is given by_________________?

A. 42 D
B. 82 D
C. 104 D
D. 124 D