car travels between A and B. The average travel is 40 kilometers per hour when going there, and the average travel is 60 kilometers per hour when returning. How many kilometers per hour does the car travel between the two places on average?
汽车往返甲、乙两地．去时平均每小时行40千米，返回时平均每小时行60千米，汽车往返两地平均每小时行多少千米？
<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

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

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

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

<gadget id="calculator">1 * 48</gadget>
<output>48</output>

<result>48</result>