In the typing competition, Li Hua typed 456 words with 6 points; Zhao Hu typed 504 words with 7 points. Which of them is faster? How many words per minute?
打字比赛，李华6分打了456字；赵虎7分打了504字．他俩谁打得快？每分多打多少字？
<gadget id="calculator">456 / 6</gadget>
<output>76</output>

<gadget id="calculator">504 / 7</gadget>
<output>72</output>

<gadget id="calculator">76 - 72</gadget>
<output>4</output>

<result>4</result>