Dad spent a total of 8.4 yuan to make long-distance calls to his uncle. They talked for a total of 12 minutes. How much was the average fee per minute?
爸爸给舅舅打长途电话一共花了8.4元，他们共通话12分钟，平均每分钟付费多少钱？
<gadget id="calculator">8.4 / 12</gadget>
<output>0.7</output>

<result>0.7</result>