Final answer:
Lucas will walk 1 mile if he takes route B.
Step-by-step explanation:
Route A is 2 miles long and is one mile longer than route B. The equation b + 1 can be used to represent this situation, where b is the length of route B. To find the length of route B, we substitute b=0 into the equation, and we get 0 + 1 = 1 mile. Therefore, Lucas will walk 1 mile if he takes route B.
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