The solution can be deduced mathematically without any knowledge of geometry. Simply consider two cases and refer to the diagram, and you’ll arrive at two elementary school-level formulas. This simply cannot be a 4 Kyu problem.

This is really strange; I agree.

Currently, I am working on a new Roman numeral kata with extensions, and I believe it should be rated 5 Kyu. It would definitely be slightly more difficult than this Kata.

And how much it need to be?

Clever approach

waiting for someone to review

Golang translation for Leap year kata

Golang translation

Random tests seem a bit unfinished: it never produces 12 for hours and 7 for days. I think it should generate numbers [0;12] and [0;7]

There is also ambiguity in the format of 3-12-3. It is unclear whether 12 represents 12 o'clock or 24 o'clock.
It may be worth considering an alternative format.

Regarding your random example, 'workHours("3-8-5")', it is unclear whether the range is from 3 o'clock to 8 o'clock or from 3 o'clock to 20 o'clock.

You are passing integer in your sample tests: 9-5-5 (which results in -1), not string

Really satisfying kata after resolving
But it lacks cases so solution may be imperfect and still pass all the tests