There is an electronic clock that lights up every 9 minutes and rings every hour. At 8 o'clock in the morning, the electronic clock both rings and lights up. When will the next time it both rings and lights up?
有一只电子钟，每9分钟亮一次灯，每个整点响一次铃．上午8时电子钟既响铃又亮灯，下一次既响铃又亮灯是多少时．
<gadget id="calculator">8 + 3</gadget>
<output>11</output>

<result>11</result>