Wang Ming is 660 meters away from the school. One day, Wang Ming left his books at school. Teacher Li helped him deliver the books. Wang Ming and Teacher Li set off from home and school at the same time respectively. After meeting each other for 6 minutes, Wang Ming walked 50 meters per minute. Teacher Li How many meters per minute?
王明距离学校660米，一天王明把书落在学校，李老师帮他送书，王明和李老师分别从家和学校同时出发，经过6分钟相遇，王明每分钟走50米，李老师每分钟走多少米？
<gadget id="calculator">660 / 6</gadget>
<output>110</output>

<gadget id="calculator">110 - 50</gadget>
<output>60</output>

<result>60</result>