A 5K maybe?

My friend told me she is running in a 10k marathon in Seal Beach on Saturday. I checked it out and they also have a 5k race starting about the same time. I'm thinking I may do the 5k, even though this is kind of a last minute decision. I walked 2 miles last week in my training. The 5k would just be 1 more mile. I have to be somewhere at 10:30 on Saturday, but I can probably do the 5k in 45 minutes or less, giving me enough time to finish it and get to my meeting. Should I? Hmmmmm......