Xiao Ming’s distance from home to school is 540 meters. Xiao Ming needs to walk 9 minutes to go to school, and only 6 minutes to go home. So how many meters does Xiao Ming walk on average per minute for a round trip?
小明从家到学校的路程是540米，小明上学要走9分，回家只用6分，那么小明往返一次平均每分走多少米？
<gadget id="calculator">540 * 2</gadget>
<output>1_080</output>

<gadget id="calculator">6 + 9</gadget>
<output>15</output>

<gadget id="calculator">1_080 / 15</gadget>
<output>72</output>

<result>72</result>