A car goes back and forth between A and B with a speed of 56 km/h. It takes 5 hours and only 4 hours to return. What is the speed of this car when it returns?
一辆汽车往返于甲、乙两地，去时的速度为56千米/时，共用5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">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">56 * (5/4)</gadget>
<output>70</output>

<result>70</result>