It took a small car 4 hours to drive from Luoyuan to He Scenic Area at a speed of 30 km/h, and it took 3 hours to return. What was the speed when returning?
一辆小车从罗源出发开往禾风景区用了4小时，时速是30千米/时，回来时用了3小时，回来时的速度是多少？
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">30 * (4/3)</gadget>
<output>40</output>

<result>40</result>