I wanna run 5km

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Speed work for a 5k? Really? I think you could get down to 20 mins easy if you just cranked out 5 miles a day at 75%-90%. Sort of an unorthodox traning schedule but thats how I did and it worked pretty well. Do that for a month and a half and BOOM, you are fine.

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http://en.wikipedia.org/wiki/Arthur_Lydiard

I would also suggest working your long run up to 1.5 to 2 hrs to run your best time.

I think those are the two biggest mistakes people make the most not long enough runs for a long run of the week and not fast enough intervals.