The distance between Xiaoming and Xiaojun’s family is 2.7 kilometers. The two started from home at the same time and walked towards each other. Xiaoming walked 42 meters per minute and met after 30 minutes. Ask: How many meters per minute does Xiaojun walk on average?
小明小军两家相距2.7千米，两人同时从家里出发，相向而行，小明每分钟走42米，30分钟后相遇，问：小军平均每分钟走多少米？
<gadget id="calculator">2.7 * 1_000</gadget>
<output>2_700</output>

<gadget id="calculator">42 * 30</gadget>
<output>1_260</output>

<gadget id="calculator">2_700 - 1_260</gadget>
<output>1_440</output>

<gadget id="calculator">1_440 / 30</gadget>
<output>48</output>

<result>48</result>