The distance between Arizona and New York is 2,000 miles by plane.
The distance between Arizona and New York is 40% greater by car, which is 40% * 2,000 = <<40*.01*2000=800>>800 miles.
This results in a total of 2,000 + 800 = <<2000+800=2800>>2,800 miles between Arizona and New York by car.
If Missouri is in the middle of the way between Arizona and New York, someone would drive half of the distance to go from Missouri to New York, which is 2,800 / 2 = <<2800/2=1400>>1,400.
#### 1400