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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Indeed. As an example and possible non-spoiler hint,
(3600 * delta_distance) / s
can produce "correct" results while
3600 * (delta_distance / s)
can fail tests.
To all the frustrated people out here: It is possible to have the correct solution and still not succeed. It is a Kata problem and not your fault.