Two missiles which are 2000 miles apart are shot towards each other. The speed of the first missile is 13000 miles per hour and the speed of the second missile is 17000 miles per hour. Find the distance between the two missiles 2 minutes before they collide.
The distance will be 1000 miles. It does not matter what he starting distance between the missiles is. 2 minutes before collision they will be (13000 + 17000)/30 = 1000 miles apart.