because that's the scale the map is drawn at...
1,000.
If 1 inch equals 400 miles on the map, then 2.5 inches on the map would equal 1000 miles in real life. This is calculated by multiplying the scale factor (1 inch equals 400 miles) by the distance on the map (2.5 inches).
400 x 2.5 = 1000 miles
1,000 miles. 400+400=800+200=1,000
One-and-a-half times 400
2.5 x 400 = 1,000 miles
1000.
1000
Assuming you mean "two and a half inches"? The answer is 1000 miles
1/400
To answer that question, I would need the context which details a scale. If one inch on a scale equals 14 miles, that scale remains the same. So two inches (which equals 1 times 2) would translate into 28 miles (because 14 times 2 is 28). The same would hold true for 400 miles. If one inch equals 400 miles, two inches equals 800 miles, and three inches equals 1200 miles.
If 400 miles is represented by 1 inch, then 2.5 inches represents 2.5 x 400 = 1000 miles.