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