Xiao Ming's average speed from point A to point B is 4 m/s, and then returns from point B to point A at a speed of 6 m/s on the same route, then Xiao Ming performs an average round trip between point A and point B What is the velocity in meters per second?
小明从A地到B地的平均速度为4米/秒，然后又从B地按原路以6米/秒的速度返回A地，那么小明在A地与B地之间行一个来回的平均速度应为多少米/秒．
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/4) + (1/6)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">2 / (5/12)</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>