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Answer: 8 am on Monday
Tick's watch is 2 minutes slow per hour, Tock's is 1 minute fast per hour, so Tock's watch is faster than Tick's watch by 3 minutes per hour.
| Correct time | Tick's Watch | Tock's Watch | Difference |
|---|---|---|---|
| 12:00 | 12:00 | 12:00 | - |
| 13:00 | 12:58 | 13:01 | 3 minutes |
| 14:00 | 13:56 | 14:02 | 6 minutes |
They get 3 minutes further apart after each 1 hour.
They will be 60 minutes further apart after 20 hours.
20 hours after midday on Sunday is 8 am on Monday.