Elapsed Time
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Most people have an intuitive sense of how to calculate elapsed time. However, this is something fairly difficult to teach because of all the possible scenarios. This Demonstration handles them all.
Contributed by: Sarah Lichtblau (March 2011)
Open content licensed under CC BY-NC-SA
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"Elapsed Time"
http://demonstrations.wolfram.com/ElapsedTime/
Wolfram Demonstrations Project
Published: March 7 2011