It took Xiaoli 12 minutes to climb the mountain, an average of 50 meters per minute, and 8 minutes to return. How many meters per minute did they walk back and forth?
小力爬山，去时用了12分钟，平均每分钟走50m，回来时用了8分钟，他们往返平均每分钟走多少m？
<gadget id="calculator">12 + 8</gadget>
<output>20</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">50 * 12 * (1/10)</gadget>
<output>60</output>

<result>60</result>