The length of the longest rail tunnel in terms of the length of the longest road tunnel is; (18.2 + L) miles
<h3>How to express length of a rail?</h3>
We are told that a rail tunnel is 18.2 miles longer than the longest road tunnel.
Now, we are told that L should represent the length of the longest road tunnel.
Now, since L represents the longest road tunnel and the rail tunnel is 18.2 miles longer than the longest road tunnel, then we can say that;
Length of rail tunnel = 18.2 + L
Thus, we conclude that length of the longest rail tunnel in terms of the length of the longest road tunnel is; (18.2 + L) miles
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