The two masters and apprentices each process 144 dolls at the same time, the master can process 18 dolls per hour, and the apprentice can process 16 dolls per hour. When both are done, how many more hours does the apprentice spend than the master?
师徒二人同时各加工144个布娃娃，师傅每小时可以加工18个，徒弟每小时加工16个．当两人都完成时，徒弟比师傅多用几小时？
<gadget id="calculator">144 / 16</gadget>
<output>9</output>

<gadget id="calculator">144 / 18</gadget>
<output>8</output>

<gadget id="calculator">9 - 8</gadget>
<output>1</output>

<result>1</result>