I can't imagine a way for you to take 60 seconds off your mile and a half time in a week, unless you didn't try the first time out. There really isn't any trick to getting faster. Just consistantly exercise, work on building endurance, since that is likely your problem. Long runs, swims, bikerides, etc... try not to walk, wade, or coast.
If you are new to running, chances are you timed it all wrong, went out too fast at the begining so you didn't have enough in you to maintain a solid effort throughout. Work on pacing yourself. Figure out your target time and calculate the pace you should be running at accordingly.
Don't buy new shoes or energy bars, or drinks, etc.... You don't want to race in new shoes, but comfortable running shoes that are broken in. That way you will be less likely to blister.
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