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A clock set right at 12 noon gains 6 minutes every hour. It now shows the time in the picture. At this moment, what angle do the hands of a CORRECT clock make?

Competition practiceClocks
  • A15°
  • B165°
  • C120°
  • D150°

Step-by-Step Solution

The dial shows 5:30, i.e. 330 min after noon. It runs 66 min per true hour, so the true time is min after noon: 5:00. At 5:00 the hands are apart. (15° is the angle on the fast clock itself.)
Answer: D) 150°

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