Question

the train was late ____3 hour which preposition in use ​

Answer 1

the train was late for 3 hours

Answer 2

The train was late by 3 hours.

Definition of preposition :

• A preposition is a word or set of words that come before a noun, pronoun, or noun phrase to indicate a direction, time, place, location, spatial relationship, or to introduce an object.
• For example - above, across, against, along, among, around, at, before, behind, below, beneath, beside, between, by, down, from, in, into, near, of, off, on, to, toward, under, upon, with and within.

Therefore, the word "by" will be suitable to fill the missing blank.

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