The answer gets a little complicated, basically because your flexibility is so great and the needs vary by age and level. You can emphasize acceleration and work some endurance at the same time by accelerating up to the distance you’re ready for and maintaining for the planned distance. If you do the reps at the exact distance you accelerate to, it’s likely that endurance will predominate, but, obviously, you can work accel to 30 or 40m and work longer with a shorter acceleration (20m + maintain for example). The variables are pretty much limitless.The example shown would most likely be from phase one of a long to short program. Our short-to-long programs tended to work out to 60m in phase one. This doesn’t imply that endurance is not there, as rep 60s with varying rests can be done. What I don’t want to do is give cookie-cutter workouts, which might not be appropriate for most readers.
I think the best idea would be for people to post planned weekly sessions for phase one with an explanation for their choices.