A truck is loaded with 20 tons of goods at a place, and has been driving at a constant speed of 60 km/h for 10 hours to reach a place B. It takes 6 hours to return to a place after unloading the goods. If the unloading time is negligible, the truck What is the average round trip speed?
一辆货车在甲地装满20吨货物，已60千米/时的速度匀速行驶10小时到达乙地，卸下货物后返回甲地用了6小时，如果卸货的时间忽略不计，这辆货车往返的平均速度是多少？
<gadget id="calculator">60 * 10 * 2</gadget>
<output>1_200</output>

<gadget id="calculator">10 + 6</gadget>
<output>16</output>

<gadget id="calculator">1_200 / 16</gadget>
<output>75</output>

<result>75</result>