17.5 seconds is superfast for an under 7 girl. 19 seconds is quick, top 10% or so for the age group.
A really good 100m dash time for a 17 year old would be anything faster than an 11.5
That's a fair time.
A 12.5-second 100m equates to a time of 4.572 seconds in the 40-yard dash.
In 2008, the Qualifying time for the 100m dash was 10.07s
Wilma time for 100 m dash was 11 plus.
Divide the 100m time by 0.9144.
9.58s for men and 10.49s for women.