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Nice Kata! I've added the Ruby translation, ready to be reviewed and accepted!
Ruby translation added, ready to be reviewed and approved!
Ruby translation added, ready to be reviewed and approved!
The 5 is the time. I've used the physics law for the speed (that is "s = (d_final - d_init) / time_elapsed"), first to obtain the speed and then to have the time.
In the description there isn't any clue for the "Three step approach", so you need to find the mathematical relation by yourself, making this kata more a math exercise than a programming one. Try to give, if not the whole relation, at least some tips for finding it.