[misanthrope]

The distance is around 3,900 miles and an earlier test of the missile in 2011 reached the site in around 30 minutes. The first missile test achieved speeds of around Mach 5 or about 3,600 mph.

Howzat again??

[Vermont Lt]

The distance is 3,900 miles to the destination.

The missile took 30 minutes to reach the destination.

How fast was the missile flying?

3,900 miles/ .5 hours = 7,800 MPH

Can someone tell me where I am wrong. Or where the article is wrong. I am confused because I used to be good at math.