1 can be regarded as finding the least common multiple of 60 and 9. 540 divided by 60 equals 9, so the electronic clock rings and lights up after 9 hours, which is 2 1.

2, still a common multiple, the difference is that the 3 1 flag has 30 sections of 4m, so the two flags at both ends intersect at120m. 120 divided by 6 equals 20 flags, and both ends are subtracted. 18 flags are still.

The divisible number of 3.3069 is Xiaoling's possible grade age and noun. 3069 divided by 9 equals 34 1, and 34 1 cannot be divisible, so Xiaoling's age is 9 years old, 1 min, 34 1 min. It may be 3 years old, 3 points, 34 1, but 3 years old can't take part in the math competition, so he is still 9 years old, 1 minute, 34 1.