Final answer:
When estimating the length of a house key, 3 inches is a more reasonable estimate than 3 miles.
Explanation:
To estimate the length of a house key, it is essential to consider the practicality of the options given. A house key is typically around 2 to 3 inches in length, making 3 inches a better estimate compared to 3 miles, which is clearly an impractical length for a house key.
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