Xiao Ning's family lives in the east of the school, and Xiao Hong's family lives in the west of the school. The distance between their two families is 1,800 meters. One day after school, the two of them broke up at the school gate and went home separately. After 20 minutes, they both arrived home at the same time. Walking 50 meters per minute, how many meters does Xiaohong walk per minute? (solution by equation)
小宁家住在学校东面，小红家住在学校西面，她们两家相距1800米，一天放学后，她们俩在学校门口分手，分别往家走，20分钟后两人同时到家，小宁每分钟走50米，小红每分钟走多少米？(用方程解)
<gadget id="calculator">50 * 20</gadget>
<output>1_000</output>

<gadget id="calculator">1_800 - 1_000</gadget>
<output>800</output>

<gadget id="calculator">800 / 20</gadget>
<output>40</output>

<result>40</result>