How To Solve Oxford's Ladder Interview Question

Oxford ranks as one of the best universities in the world. Can you solve this ladder problem, which is adapted from an admission interview question?

Source
http://www.ox.ac.uk/admissions/underg...

Desmos animation
https://www.desmos.com/calculator/86h...

Websites consulted in research
http://wordplay.blogs.nytimes.com/201...
http://mathematicsbhilai.blogspot.com...
http://www.mathematische-basteleien.d...
https://www.geogebra.org/m/ZUAcBme2
   • Puzzle ~ Riding a Falling Ladder (A Counte...  

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