It took Xiaolan 12 minutes to walk from Guantianpei East Road to Guantianpei West Road at a speed of 50 meters per minute, and then returned along the original road at a speed of 75 meters per minute. During this round trip, how much did Xiaolan walk per minute on average ?
晓兰以每分钟走50米的速度从关天培东路走到关天培西路用了12分钟，然后以每分钟走75米的速度沿原路返回，这次往返中，晓兰平均每分钟走多少？
<gadget id="calculator">50 * 12</gadget>
<output>600</output>

<gadget id="calculator">600 / 75</gadget>
<output>8</output>

<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">600 * (1/10)</gadget>
<output>60</output>

<result>60</result>