A car travels from A to B at a speed of 80 km/h and takes 6 hours. It only took 4 hours to return, what was the speed of the car when it returned?
一辆汽车从甲地开往乙地，去时的速度是每小时80千米，共用了6小时．返回时只用了4小时，这辆汽车返回时的速度是多少？
<gadget id="calculator">6 / 4</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">80 * (3/2)</gadget>
<output>120</output>

<result>120</result>