9. Using the 24 -hour clock, the time $16: 11: 22$ on the date $16 / 11 / 22$ (i.e. the 16 th of November 2022) has hours, minutes and seconds equal to date, month and (two-digit) year respectively. Let $\mathrm{S}$ be the number of seconds which will elapse after that date and time until this phenomenon next occurs.
What is the value of $\sqrt{S}$ ?
SolUTION
300

The next such time and date will be 17:11:22 on 17/11/22. This is one day and one hour later. The number of seconds which will elapse is $25 \times 60 \times 60=90000$. Therefore, $\sqrt{S}=5 \times 60=300$.