There is an electronic clock, which lights up every 9 minutes, rings at 12 o'clock, and lights up at 12 o'clock. When is the next time?

There is an electronic clock, which lights up every 9 minutes, rings at 12 o'clock, and lights up at 12 o'clock. When is the next time?

Since the electronic clock rings on the hour, we just need to consider which time to turn on the light. From 12 noon, how many 9 minutes does it take to turn on the light every 9 minutes? Because 1 hour = 60 minutes, the problem is: how many times of 9 minutes is the integral multiple of 6O minutes? In this way, the problem is

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