## 223. Math Puzzle $12 / 83$

In a grandfather clock, the seconds pendulum completes one oscillation in only 0.9999 seconds. As a result, the clock runs fast.

By how much does the error increase within one week?
The error of the clock is $0.0001 \mathrm{~s}$ after 1 second. After one day (86400 s) it is thus 8.6 s. After one week $60.48 \mathrm{~s} \approx 1$ minute.