Hannah = (1/2) 18 = 9

9 + 18 = <<9+18=27>>27 km

Together they walked 27 kilometers.

# Answer

27
Question:
Nadia walked 18 kilometers, which was twice as far as Hannah walked. How many kilometers did the two girls walk in total?
Answer:
Let's think step by step.

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27
Nadia walked 18 kilometers, which was twice as far as Hannah walked. How many kilometers did the two girls walk in total?
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