A car travels from A to B at a speed of 80 km/h. It takes 4 hours to return and 5 hours to return. What is the speed of the car when it returns?
一辆汽车以80千米/时的速度从甲地开往乙地，用了4小时，返回时用5小时，这辆汽车返回时速度是多少？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">80 * (4/5)</gadget>
<output>64</output>

<result>64</result>