Greek Anthology Book XIV: Metrodorus: 142

Arithmetical Epigram of Metrodorus
Arise, work-women, it is past dawn; a fifth part of three-eighths of what remains is gone by

Solution
Let $t$ be the time in hours since dawn.

It is assumed that the day is $12$ hours long.

We have:

So $\dfrac {36} {43}$ of an hour has passed since dawn.