Eliud Kipchoge runs marathon in 1:59:40.2

Eliud Kipchoge breaks 2 hour marathon barrier. 

 On October 12^th 2019, Eliud Kipchoge ran a marathon in Vienna in under 2 hours. He has now broken a barrier of what humans are capable of accomplishing. We wondered how record marathon times have changed through the years.  Will those record times keep being broken?  Does the data help you predict?

For Adventurer members we have an editable Word docx, an Excel sheet of our data with a chart, and solutions.