A truck travels from A to B at a speed of 75 km/h. It takes 8 hours and 15 hours to return. What is the speed when returning?
一辆卡车以75千米/时的速度，从甲地开往乙地，用了8小时，返回时用了15小时，返回时速度是多少？
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">75 * (8/15)</gadget>
<output>40</output>

<result>40</result>