The whole journey is 60 kilometers from place A to place B. Xiao Ming travels 30 kilometers per hour from place A to place B by motorcycle, and 20 kilometers per hour from place B to place A. What is the average speed of Xiaoming’s round trip per hour? km?
甲地到乙地全程60千米，小明骑摩托车从甲地到乙地每小时行30千米，从乙地到甲地每小时行20千米，小明往返的平均速度是每小时行多少千米？
<gadget id="calculator">60 / 30</gadget>
<output>2</output>

<gadget id="calculator">60 / 20</gadget>
<output>3</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">60 * (2/5)</gadget>
<output>24</output>

<result>24</result>