A manuscript has a total of 975 characters, Liu Gang finished typing in 13 minutes, and Li Zheng finished typing in 15 minutes. How many more words does Liu Gang type per minute than Li Zheng?
一份稿件共975个字，刘刚13分钟打完，李正15分钟打完．刘刚每分钟比李正多打多少字？
<gadget id="calculator">975 / 13</gadget>
<output>75</output>

<gadget id="calculator">975 / 15</gadget>
<output>65</output>

<gadget id="calculator">75 - 65</gadget>
<output>10</output>

<result>10</result>