calculating my pace

calculation of how many mile I run .
Thanks To YODA ...How tell me how many km is 1 mile - 1.6KM
So i calucate my timing as a book said

10KM = 6.26 mile.
Calculating my pace 82 mins/6.2 miles = 13.13 min/miles

But calucating in 10KM

82 min/10KM= 8.2KM/min

My Pace is 13.13 min/miles in 10km

I am currently training at a 13 minute/mile pace; my goal is to run
the 10K at a 12.5minute/mile pace.”

GOAL FOR 12 OCT 2010 NOWARDS
I am currentlyhaving 8.2 min/KM . My GAOL IS TO RUN
10K is 8 min /KM .