car travels from A to B at a speed of 60 km/h. It takes 4 hours to get there and only 2 hours to return. What is the speed when it returns?
一辆汽车从甲地到乙地，去时的速度60千米/时，用了4小时送到，返回时只用了2小时，返回时的速度是多少？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<result>120</result>