Xiaohong and Xiaofang walk from the school in opposite directions at the same time. Xiao Hong walks south 68 meters per minute, Xiao Fang 72 meters per minute. After 15 minutes, how much more did Xiaohong walk than Xiaofang?
小宏和小方同时从学校朝相反方向行走．小宏每分钟走南68米，小方每分钟72米．15分钟后，小宏比小芳多走了多少米？
<gadget id="calculator">72 - 68</gadget>
<output>4</output>

<gadget id="calculator">4 * 15</gadget>
<output>60</output>

<result>60</result>