Does this answer your question? [Why do you say "Fifty miles IS ......"?](https://ell.stackexchange.com/questions/13950/why-do-you-say-fifty-miles-is) ...... and [100 apples are/is considered as a large number of apples](https://ell.stackexchange.com/questions/145690/100-apples-are-is-considered-as-a-large-number-of-apples)
– VoidJun 21 '21 at 14:41
Try flipping the sentence around: "A long distance is/are two miles."… There is only one *distance*, which is 2 miles long by measure.
– wetcircuitJun 21 '21 at 14:46