The master and apprentice make a total of 288 parts. The master makes 18 parts per hour, and the apprentice makes 12 parts per hour. The master has already finished 48 parts. How long will it take for the rest of the master-student cooperation?
师徒两人共做288个零件，师傅每小时做18个，徒弟每小时做12个，师傅已经做完了48个，剩下的师徒合作还要多长时间？
<gadget id="calculator">288 - 48</gadget>
<output>240</output>

<gadget id="calculator">18 + 12</gadget>
<output>30</output>

<gadget id="calculator">240 / 30</gadget>
<output>8</output>

<result>8</result>