Need for Speed

Well, just completed my second Park Run at Cannon Hill.... lovely day, loads of people, enjoyed the run, although not the result.... a pretty poor 27:21. I finished behind my daughter on her first Park Run, as well as other friends... left me wondering what I have to do to improve my time... I have an imaginary target in my head of trying to get under 25 mins for 5k and under 50 mins for 10k...... not sure how realistic this is given my age and natural lack of speed, but will have to ask around to see what sort of things I should be doing to improve. Not that I may ever achieve these targets, but at least it's fun trying.