The car travels 75 kilometers per hour. At this speed, the truck takes 9 hours to travel the distance traveled in 6 hours. How many kilometers per hour does the truck travel?
汽车每小时行75千米，按这样的速度，6小时行驶的路程，卡车需要用9小时行完，卡车每小时行多少千米？
<gadget id="calculator">6 / 9</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">75 * (2/3)</gadget>
<output>50</output>

<result>50</result>