Xiao Gang and Xiao Miao need to make 600 parts. Xiaogang makes 15 per hour, and Xiao Miao makes 20 per hour. After Xiaogang did it for 8 hours, Xiao Miao completed the rest independently. How long can Xiao Miao complete the task?
小刚和小苗要做600个零件．小刚每时做15个，小苗每时做20个．小刚做了8时后，余下的由小苗独立完成，小苗再做多少时能完成任务？
<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<gadget id="calculator">600 - 120</gadget>
<output>480</output>

<gadget id="calculator">480 / 20</gadget>
<output>24</output>

<result>24</result>