.4 miles is how many feet?
0.4 miles is 2,112 feet.
To get your answer, you first have to know how many feet are in a mile. There are 5,280 feet in a mile.
I divided 5,280 by 2.5 to get my answer, because if you divided 5,280 by 2, you will get half of a mile (2,640 feet) and dividing by 3 give us too small an answer.
Sorry for the poor explanation, if anyone wants to edit this for me and give a better explanation, it'd be greatly appreciated.
Hope I helped though, Good day!