A mountain road is 600 meters long. A person walks 60 meters per minute when going up the mountain and 100 meters per minute when going down the mountain. What is the average speed of this person going up and down the mountain?
一段山路长600米，一人上山时每分钟走60米，下山时每分钟走100米，此人上山、下山的平均速度是多少米？
<gadget id="calculator">600 / 60</gadget>
<output>10</output>

<gadget id="calculator">600 / 100</gadget>
<output>6</output>

<gadget id="calculator">10 + 6</gadget>
<output>16</output>

<gadget id="calculator">2 / 16</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">600 * (1/8)</gadget>
<output>75</output>

<result>75</result>