There are 60 math problems at the entrance, Xiaohong completed it in 7.5 minutes, and Xiaojun completed it in 8 minutes. How much faster does Xiaohong do than Xiaojun per minute on average?
有60道口算题，小红用了7.5分钟完成，小军用了8分钟完成，小红平均每分钟做的比小军快多少道？
<gadget id="calculator">60 / 7.5</gadget>
<output>8</output>

<gadget id="calculator">60 / 8</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">8 - (15/2)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>