Based on his other prs, what is my friend's pr in the mile? Make guesses and I will tell you in a few days.

with 53s speed, it is

that 8'37i is probably worth 3s quicker outdoors ( banking thread ), so that's ~ 8'34 compared to 8'30 off 14'59 with 53

with no 400 guidance, the best empirical conversion i've found to compare 1500 - 10k ( even upto M ) is conversion factor to speed of

ratio of distances^0.0691729

in that case, your 14'59 is worth outdoors

~ 8'40.7

What if I threw in that it was fairly windy and I ran alone most of the 5k race, and that I hung right with a group of people for the 3k?