The truck drove from Nanjing to Shanghai and traveled 180 kilometers in 2 hours. According to this speed, how many hours will it take to complete the 540 kilometers?
卡车从南京开往上海，行了2小时走完了180千米，照这样的速度计算，行完全程540千米，需要几小时？
<gadget id="calculator">180 / 2</gadget>
<output>90</output>

<gadget id="calculator">540 / 90</gadget>
<output>6</output>

<result>6</result>