Look at the photos. How to solve this math problem (4 problems)? Summer homework for the second grade of primary school. thank you
If twelve monkeys stand guard separately, change the monkey station every hour. If eleven monkeys stand at twelve o'clock, one monkey will stand at twelve o'clock, and the minute hand and the hour hand will coincide at 1: 05 next time and at 2: 1 1 next time. By analogy, the minute hand and the hour hand will coincide within 12 hours 1 1 time.