Question

After Hillary realized her clock was running 30 minutes fast, she used a knob on the clock to turn the minute hand back 30 minutes. Which describes the rotation of the minute hand?
180 degrees clockwise rotation
90 degrees clockwise rotation
90 degrees counterclockwise rotation
180 degrees counterclockwise rotation

Answer 1

If Hillary turned the minute hand back 30 minutes, that means she moved it in the opposite direction of time passing. Since the minute hand completes a full rotation (360 degrees) in 60 minutes, turning it back 30 minutes would be a half rotation.

30 minutes corresponds to a movement of 180 degrees, and since she is moving the hand back (counterclockwise), the correct description of the rotation is:

**180 degrees counterclockwise rotation**.