When Xiao Ming climbs the mountain, he travels an average of 8 kilometers per hour when going up the mountain, and 12 kilometers per hour when going down the mountain from the original road. How many kilometers per hour does Xiao Ming travel on average?
小明登山，上山时平均每小时行8千米，从原路下山时平均每小时行12千米，小明平均每小时行多少千米？
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

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

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/8) + (1/12)</gadget>
<output>5/24 = around 0.208333</output>

<gadget id="calculator">2 / (5/24)</gadget>
<output>48/5 = around 9.6</output>

<result>48/5 = around 9.6</result>