Slower than a dead rat

If Jordan wakes up at 7 am, leaves her house at 7:10 am, keels out of the driveway after clearing the snow off her car and scraping the windows, slowly makes her way through traffic to work which is 10.5 miles away, and arrives at the school at 8:35 am--what is her average driving speed in miles per hour?

Answer: 7.1 mph