sub 40 or 45 min program?

[rook]

I did a 10K around the track yesterday. I got a new PB of 43:58! I felt really comfortable at that pace and still had some energy at the end. It was a bit cold and rainy, but those are perfect conditions for someone like me who can't deal with the heat Here are my lap times:

1:43
1:47
1:48
1:46
1:47
1:47
1:47
1:45
1:44
1:45
1:45
1:46
1:46
1:45
1:46
1:46
1:47
1:46
1:47
1:46
1:46
1:45
1:44
1:43
1:41

I'm now aiming 42min for my race in 6 weeks. What do you think of that target? What pace times should I use in training? I was thinking of

8:10 for the 2k
3:55 for the 1k
88sec for the 400m