A person rides a bicycle back and forth between A and B with a speed of 24 km/h when going there and a speed of 16 km/h when returning. So what's the average round trip speed?
某人骑自行车往返甲、乙两地，去时的速度是24千米/时，返回时的速度是16千米/时．那么往返的平均速度是多少？
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">1 / 24</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">(1/24) + (1/16)</gadget>
<output>5/48 = around 0.104167</output>

<gadget id="calculator">2 / (5/48)</gadget>
<output>96/5 = around 19.2</output>

<result>96/5 = around 19.2</result>