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Starting from the time shown, when will the two hands of the clock first be at right angles to each other?

Competition practiceClocks
  • A54 6/11 min past 7
  • B38 2/11 min past 7
  • C21 9/11 min past 7
  • D21 min past 7

Step-by-Step Solution

At 7:00 the minute hand is behind the hour hand and gains per minute. It is behind after min, i.e. at min past 7.
Answer: C) 21 9/11 min past 7

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