Xiao Ming walks 150 meters per minute from home to school, takes 15 minutes to walk, and takes 10 minutes to return, how many meters per minute? (Solve with ratio)
小明从家到学校，去时每分钟走150m，要走15分钟，返回时用10分钟，每分钟走多少米？(用比例解)
<gadget id="calculator">150 * 15</gadget>
<output>2_250</output>

<gadget id="calculator">2_250 / 10</gadget>
<output>225</output>

<result>225</result>