To produce 63 parts, if the master does it alone, it can be completed 5 hours earlier than the prescribed time; if it is done by the apprentice alone, it can be completed 7 hours beyond the prescribed time. The two masters and apprentices first cooperated for 3 hours, and then the apprentices did it alone, which happened to be completed within the specified time. Question: How many hours are required to complete the task?
生产63个零件，若由师傅独做可比规定时间提前5小时完成；若由徒弟独做超过规定时间7小时才能完成．师徒二人先合作3小时，再由徒弟独做恰好在规定时间内完成．请问：规定完成任务的时间是多少小时．
<gadget id="calculator">63 / 7</gadget>
<output>9</output>

<gadget id="calculator">9 + 5</gadget>
<output>14</output>

<result>14</result>