A 40k marathon is about 25 miles.
Ebay. Several Warhammer 40k forums have selling threads as well.
AnswereBay is a good place to look.
Defineitley 40K.
run.
40k means 40,000
40K decays to 40Ar 10.9% of the time Measure 40Ar = 9.57 ppm, 40K = 12.16 ppm Answer: 87.83 ppm D = A(ekt-1) k = 5.54 x 10-10
^40K
The numerical equivalent of 40k is 40,000
The best website I know of is ebay, I really don't know of any specific websites that deal in just painted 40k models.
It is exactly, no more, no less - 40 kilometers. If you are unsure of the length of a kilometer, 1 kilometer is 1000 meters.
Sub 20 for a Man and sub 25mins for a girl is a good time.