Math Quiz: NYT Learning Network

Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network.  My latest contribution, a Test Yourself quiz-question, can be found here:

https://learning.blogs.nytimes.com/2012/04/02/test-yourself-math-april-2-2012/

This question is based on Fred Newman’s world record of 20,371 free throws in 24 hours.  How fast was he making those shots?