The school held a computer Chinese character input skills competition. It was originally planned to select 15 first prizes and 20 second prizes. Now the last 5 of the first prizes are adjusted to the second prizes. Minutes increased by 8 characters, and the average of the second prize winners increased by 6 characters per minute. How many words per minute are the average speed of the original first prize faster than the average speed of the original second prize?
学校举行计算机汉字输入技能竞赛，原计划评选出一等奖15人，二等奖20人，现将一等奖中的后5人调整为二等奖，这样一等奖获得者的平均速度每分钟提高了8个字，二等奖获得者的平均每分钟提高了6个字．原来一等奖的平均速度比原来二等奖平均速度每分钟多多少个字？
<gadget id="calculator">15 - 5</gadget>
<output>10</output>

<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">25 * 6</gadget>
<output>150</output>

<gadget id="calculator">80 + 150</gadget>
<output>230</output>

<gadget id="calculator">230 / 5</gadget>
<output>46</output>

<result>46</result>