I do not know exactly for boys, but I am a 7th grade girl and it takes me 15-16 seconds.
Im a 7th grader and I ran mine in 13.4 my friend ran his in 12.8.
I am now an 8th grader who runs 12 seconds flat, but in 7th grade I could beat most of the eighth graders with 12.5.
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the average time should be around 13-15 seconds. the good athlete will run in the 12 range. if you are running under 12 you are fast