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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.
Because 1.08kph is equal to 30cms so he has divided 30 by 1.08 giving the the answer of 27.7778.
He now multiplies the speed by this number giving him the answer in cms.