90 degrees
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There is no such time as '3000'. The 24 hour clock has a maximum time of 2359. ( One minute to midnight). 2400/0000 (midnight) is not used because of possible confusion over the day/date. The 24 hour clock times are from '0001' to '2359' . This includes '1215'.
The minute hand, which is pointing at 3 is at right angles to 12. But the hour hand is no longer pointing at 12. The hour hand does not stay at 12 from 12:00 to 12:59 and then jump through 30 degrees at 1 o'clock. By 12:15, the hour hand has moved 7.5 degrees (clockwise) so at 12.15 the angle is 90-7.5 = 82.5 degrees.
between 1215 and 1217
√1215 = 34.856850116
1215 = 12150/10