Multiple choice

How many times do the hands of a clock are at 90° from each other in 12 hours?

  1. 11

  2. 22

  3. 12

  4. 24

  5. 18
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hands of a clock are at 90 degrees twice every hour, except for specific hours where they overlap. In 12 hours, they form 90 degrees 22 times.

AI explanation

The hands of a clock are at 90 degrees when they are 15 minutes apart. In a span of 12 hours, the minute hand laps the hour hand 11 times, creating a right angle twice during each cycle. By multiplying 11 cycles by 2 right angles per cycle, we get 22 instances. The correct result is 22.

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