Is this a good 100 meter sprint time?

[Hello]

I'm a 15 year old guy (sophomore) and my brother timed me on the street with no spikes on (he said he timed it pretty accurately) and i got 11.3

so if i ran on a track with spikes on, around what time would you say i could get?

and is that time good?

 

[MontyH1]

the times wouldnt be a whole lot different, but that is a pretty good time.

 

[garym]

Your time on the street probably wasn't accurate