A car travels from A to B in 5 hours at 80 km/h. It only took 4 hours to return, what speed was the car returning?
一辆汽车从甲地开往乙地，用了5小时，80千米每小时．返回时只用4小时，这辆汽车返回时速度是多少？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">80 * (5/4)</gadget>
<output>100</output>

<result>100</result>