At the present time (2008), around 4.6 seconds, or 4.2 seconds for 40yards.
In 2007 I was 15 years old and I amazingly got a time of 4.28 seconds on a school 40 meter sprint event. Since then I have never been close to achieving this time.
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you should try to have a steady start is is slightly faster than your jogging speed. then continue ot this speed until you are at the 200m mark. that is when you want to start sprints of 50m or so upto the 100m mark. At the 100m mark you sould begin to sprint at your top speed. dont try and go out on the day of the event and then try to do your best. youd start preparing for this about a week or 2 before the event. that way your body doesnt get cramped and is able to keep going to the finish.
there isn't a certain speed at which you should run 40 metre. it all depends on your physical abilities.
You need to prepare yourself to run the 400 meter race by getting your body into shape, drinking a lot of water, and running and getting your resistance up every day.