A truck transports goods from A to B. It takes 12 hours to go at a speed of 60 kilometers per hour, and only 9 hours to return. What is the speed of the truck when it returns?
一辆货车从甲地运货去乙地，去的时候速度是每小时60千米，用了12小时，返回时只用了9小时，这辆货车返回时的速度是多少？
<gadget id="calculator">12 / 9</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">60 * (4/3)</gadget>
<output>80</output>

<result>80</result>