First. The distance between two places is 360 kilometers. A car travels from A to B at a speed of 40 kilometers per hour. When returning, because there was no load, it was driving at a speed of 60 kilometers per hour. What is the average round trip speed of this car in kilometers per hour?
甲．乙两地相距360千米，一辆汽车从甲地开往乙地，去时以每小时40千米的速度行驶．返回时由于没载东西，以每小时60千米的速度行驶．这辆汽车往返的平均速度是每小时多少千米？
<gadget id="calculator">360 / 40</gadget>
<output>9</output>

<gadget id="calculator">360 / 60</gadget>
<output>6</output>

<gadget id="calculator">9 + 6</gadget>
<output>15</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">360 * (2/15)</gadget>
<output>48</output>

<result>48</result>