Xiaofang spent a total of 4.5 yuan to make a long-distance call to her grandmother. The call time is 15 minutes. How much is the average per minute?
小芳给外婆打长途电话，一共花了4.5元，它们通话时间是15分钟，平均每分钟多少钱？
<gadget id="calculator">4.5 / 15</gadget>
<output>0.3</output>

<result>0.3</result>