Xiao Ming's speed from home to school is 60 meters per minute, and his speed from school to home is 40 meters per minute. What is the average speed of one round trip in meters per minute?
小明从家到学校的速度是每分钟60米，从学校回家的速度是每分钟40米，往返一次的平均速度是每分钟多少米．
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/60) + (1/40)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">2 / (1/24)</gadget>
<output>48</output>

<result>48</result>