Xiaoqiang comes home from school at 5:00 p.m. and immediately does his homework. When the homework is completed at 5:30, what is the angle between the hour hand and the minute hand?
小强下午5点放学回到家，立即写作业，作业完成时是5时30分，此时时针与分针的夹角是多少．
<gadget id="calculator">30 * 0.5</gadget>
<output>15</output>

<result>15</result>