The term '15 hours' (fifteen hours) is a noun phrase, a group of words based on a noun (hours) that functions as a unit as a noun in a sentence.
The noun '15' (fifteen) is functioning as an attributive noun (a noun functioning as an adjective) to describe the noun 'hours'.
Examples:
Fifteen hours is the estimated driving time. (subject of the sentence)
We drove for fifteen hours to get here. (object of the preposition 'for')
145/2=72.5 MPH
What type of noun is childhood
Countryside is a type of common noun.
The noun thunder is a singular, common, concrete noun, a word for a thing.
What type of noun is the word Dell computer What type of noun is the word Dell computer
Noun
not a noun
noun
Noun
The word type is both a noun and a verb (type, types, typing, typed). Example uses: As a verb: I type on the computer. As a noun: What type of computer do you use? Verb and noun: First type the cells, then describe the types.
The noun "wave" is a common noun.
The noun "noun" is a singular, common, concrete noun, a word for a thing.