Maybe it shoud be done other way around? Check for valid numbers insead of checking if its false?

Very bad description. You shoud mention that we need to check if both values are equal and add one iteration. Please change the description that it mentions the above. I have to check for discourse to find that hint.

Very fun kata, maybe its too easy to be classified as 6kyu task

Please add in description note about distance units. You did not mentioned that distance was in miles not in KM. I think its fair to say that.
Furthermore the kata was good practise for my beginner skills :)

Good point. I was wondering what this function shoud return...
Please change description

Lol xD

Bro, thank You so much! The description is awful AF. Without You I would skip this kata...

Please, somebody delete this kata or rewrite the description.

I have problem, why input array is diffrent from output result array?
In this case :
[ -24, -33, 40, -7, -7, 3, 40, -33, -30, 8, 5, 14, 48 ] <= input array
[ -24, -33, 40, -7, 3, 5, 40, 41, -30, 8, 47, 14, 48 ] <= output result
I dont see 41 in given array, so why result includes it?
Perhaps I dont understand details about this kata.

Thanks for it :D