The hour hand completes a full rotation of 360° in 12 hours.
The angle covered by the hour hand in 1 hour:
Angle per hour=12360°
Angle per hour=30°
Convert 1 hour 20 minutes to hours:
1 hour 20 minutes=1+6020 hours
=1+31 hours
=34 hours
The angle covered by the hour hand in 1 hour 20 minutes:
Angle=34×30°
=3120°
=40°
Therefore, the hour hand covers 40° in 1 hour 20 minutes.