A motorcycle travels 60 miles at a speed of 20 miles per hour. On the way home, his average speed was 30 miles per hour. What is the average speed of the motorcycle during the entire round trip?
一辆摩托车以每小时20英里的速度行完60英里的旅程．在回家的路上，他的平均速度是每小时30英里．问摩托车在整个来回的旅程中，平均速度是多少？
<gadget id="calculator">60 / 20</gadget>
<output>3</output>

<gadget id="calculator">60 / 30</gadget>
<output>2</output>

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