This is the 14418th most frequent German word.
kilometerweit
"Kilometerweit" means "for kilometers" or "kilometers away."
In this sentence, 'kilometerweit' is used as an adverb describing the extent to which the subjects could see, implying a vast distance.
Wir konnten kilometerweit über die Felder sehen.
We could see for miles over the fields.
Here, 'kilometerweit' modifies the verb 'to hear', indicating the wide area over which the music could be heard, figuratively emphasizing its loudness.
Die Musik war kilometerweit zu hören.
The music could be heard for miles.
In this context, 'kilometerweit' describes the length of the road as an adverb, emphasizing the extended distance it covers.