Xiaoqiang rides a bicycle to his grandmother's house at a speed of 120 m/min, arrives in 12 minutes, and takes 8 minutes to return. What is the average speed in meters per minute when Mingming returns?
小强骑自行车去外婆家，去时的速度是120米/分，12分钟到达，回来时用了8分钟．明明返回时的平均速度是多少米/分？
<gadget id="calculator">12 / 8</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">120 * (3/2)</gadget>
<output>180</output>

<result>180</result>