0
I assume you mean a digital clock and that it only displays hours and minutes, not seconds. I'll also assume it's set to standard AM/PM time, not 24 hour time, which would be a bit different.
The times that would display exactly three 1s are:
- 1:11
- 10:11
- 11:01
- 11:10
- 11:12
- 11:13
- 11:14
- 11:15
- 11:16
- 11:17
- 11:18
- 11:19
- 11:21
- 11:31
- 11:41
- 11:51
- 12:11
That's 17, and they would be displayed 2x per day each, so 34 minutes in total.
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