Can a runner beat a horse in a race?

This weekend it's the annual Man v Horse Marathon across hill and dale in the Brecon Beacons. But is it possible for runners to outpace horses?

BBC, 10th Jun 2010

Link: http://news.bbc.co.uk/go/rss/news/int/search/news+sport/science/-/2/hi/uk_news/magazine/8732434.stm