The master and apprentice need to make 294 parts, the master makes 36 parts per hour, and the apprentice makes 24 parts per hour. After the master has done 54, how much time will it take for the master-student cooperation to complete the task?
师徒两人要作294个零件，师傅每小时做36个，徒弟每小时做24个．师傅做54个后，师徒合作还要多少时间才能完成任务？
<gadget id="calculator">294 - 54</gadget>
<output>240</output>

<gadget id="calculator">36 + 24</gadget>
<output>60</output>

<gadget id="calculator">240 / 60</gadget>
<output>4</output>

<result>4</result>