40 min target achieved

I had the target to run 3 and half loops in 40 minutes, to be achieved by the end of this month. Today i achieved it.
The total distance - 7.7 Kms
Time taken - 39mins 55 sec.
Average speed - 5.23 min/Km

Next target is run the same distance in low 39 min like 39:10 something. That would be a target speed of 5.15 min/Km. I felt strong during today's workout, so i think it will not take more then two weeks to reach sub 39 min for the distance.