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Retrofire was about 3 seconds late , which accounts for about 20 miles of the overshoot . On that visit , I went to places that are not usually tourist destinations , including for example , El-Arish , just about 20 miles from the Gaza Strip in the Northern Sinai . In this example , the 11 minutes of delay easily could be the difference between the time it would take to travel the 20 miles at the posted speed with no stops and the time it would actually take during the height of the rush hour . The Days Inn San Diego offers affordable accommodations approximately 11 miles from San Diego International Airport , about four miles from Mexico , and about 20 miles from Old Town San Diego . A quiet observing site was required and the University 's botanical station at a little known place called Jodrell Bank , 20 miles south of Manchester , was the ideal location . The group includes about 150 people , most of whom are based at Jodrell Bank Observatory , which lies 20 miles south of Manchester in pleasant Cheshire countryside , and the remainder are on the main University campus in the Sackville Street building . A transceiver with a dish antenna on the roof of the supercomputer center building exchanges data with a similar unit on the radio relay towers on Mt. Woodson , 20 miles inland . The basin , which lies about 20 miles north of Dinosaur National Monument , had been part of a Colorado citizens ' wilderness proposal since 1994 . The standard race distance is approximately 20 miles and includes up to 10 checkpoints plus the final challenge at the finish . ) would identify a nonparticipating segment 2.0 miles in length . The company has room to grow and has no plans to move out of downtown Norwood , a small South Shore town about 20 miles from Boston .