Because you are working from a standing, rather than
flying start you will find that taking one from the other gives you a positive
results of around a second.
Some people simply use 30m runs as a test of both speed and acceleration, but
it can be useful to split them and find out if you can get to speed quickly, or
if your top speed is good whilst your accleration could be improved on.
Any results of less than 1.1 - 1.2 seconds for any athlete means that they
are able to accelerate up to top speed well.