Problem 2. Two sidi clocks were set to show the exact time on March 21, 2022, at 9 PM. One works accurately, while the other is fast by 3 minutes every hour. On which date and at what time will the hands of the two clocks be in the same position as on March 21, 2022, at 9 PM?
Solution. To achieve the coincidence of the hands, the faster clock needs to gain a lead of 12 hours. Twelve hours are 720 minutes.

This will be $720: 3=240$ hours. However, 240 hours are 10 days. The clocks will be in the same position on March 31, 2022, at 9 PM.