Kenyan pro runner Ruth Ruth Chepng'etich marathon world record made official

Kenya's Ruth Chepng'etich won the Chicago Marathon in October in the fastest time ever recorded for the distance. She crossed the finish line in just 2 hours, 9 minutes and 56 seconds. That's faster than 5 minutes per mile. The win was so extraordinary that it had some people questioning whether it was valid. Now, the results are in and Chepng'etich's world record is finally official. The World's Bianca Hillier has the details.