"Long" is one of those slippery rubber words that are completely unscientific
because they mean different things to different people, and can even mean
different things to the same person at different times.
If you're in a battleship or a jet aircraft, then 3 miles is not long at all. But
if you're in a wheelchair, then 3 miles is quite long.
3 months
3 hours
At least 3 hours 7 minutes.
If the miles are nautical ones, then it takes (3)/(the boat's speed in knots) hours. If the miles are statute ones, then it takes (2.6053)/(the boat's speed in knots) hours.
If you walk 3 miles in one hour, you would walk 6 miles in two hours because 6 divided by 3 equals 2.
3 miles long
one hour.
her journey was 4,000 miles long.
About 3 miles, it is exactly 3.106855 miles long
22 miles long and 3 miles wide
The track is about 3 miles long
It is 1.75 miles!
Presumably, 3 miles.
3 miles.
3 minutes
About one eighth of a mile.
400 miles