From the sounds of it you may be best doing some fartlek workouts (which can be performed anywhere) in the time remaining so you can touch on all the energy systems at once.
You can certainly improve your times through accumulating mileage also, although this isn't the most effective way.
Do you have access to a football pitch in a local park? As the perimeter of the pitch is great for sprint sessions.. even interval them as sprints down the length and recover across the widths (goal lines).
I have used this method loadsa times and its been great to improve speed!
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