Just off hand based on those times if you take your 60m time, add a reaction 0.15s, then add the difference between your 30 fly and your 60 fly divided by 3 and multiply by 4 (to make 40m) it would give you:
7.16+0.15+(((6.26-3.05)/3)*4))= 11.59s
Of course this is just a prediction based on your times, and this combination of times seems to make the most sense to me. You could use the difference between you’re flying 100m time and 60m time to figure out the last 40m but that 40 would really be around 80-120m times.
Based on that 200m: 23.x
Of course you’re best bet would be to use the system to time a full 100m and add a reaction.
I’ve had an interesting experience with this sort of adding of times experiment.
My 35m time is 4.41s, my flying 25m is 2.41s, combined that makes 6.82 for 60m, add a 0.15s reaction and that makes exactly my pb in the 60m.