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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.
The test are the same in all languages and 1373 guys passed the kata so I am quite sure there are no errors in the tests. Did you read the post below?
Operations on float can have different results if you change the order and associativity is not always true. You can read: http://www.walkingrandomly.com/?p=5380. Maybe you could try (3600 * delta distance) / delta speed.
Cheers!