Here's a really cool website that let's you input 3D points!
http://technology.cpm.org/general/3dgraph/
From the attached picture you can see that the point has moved back 5 units, to the left 5 units, and up 5 units.
Answer:
1.375
Step-by-step explanation:
<span>Will ran 1.33333333333 miles on his second day of training.</span>