Greek Anthology Book XIV: 6. - Problem

Problem
"Best of clocks, how much of the day is past?"

There remain twice two-thirds of what is gone.

Solution
Let $h$ be the number of hours that have passed.

A day of $12$ hours is assumed.

Then:

So $5 \frac 1 7$ hours have passed, and $6 \frac 6 7$ remain.