For highways, tunnelling is preferred to if the open cut exceeds : Options: A . &nbsp10 metres depth B . &nbsp15 metres depth C . &nbsp20 metres depth D . &nbsp25 metres depth.

For highways, tunnelling is preferred to if the open cut exceeds :

Question

For highways, tunnelling is preferred to if the open cut exceeds :

Options:

A . 10 metres depth

B . 15 metres depth

C . 20 metres depth

D . 25 metres depth.

Answer: Option B
Answer: (b).15 metres depth

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