Mom bought an alarm clock for Jiajia, which lights up every 9 minutes and rings every hour. At 10 o'clock in the morning, it both lights up and rings the bell. Do you know when the next time it will turn on the lights and ring the bell?
妈妈为佳佳买了一个闹钟，每走9分钟亮一次灯，每到整点响一次铃．上午10时整，它既亮灯又响铃，你知道下一次既亮灯又响铃是几时吗？
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