The distance between the two cities is 540 kilometers, and a car travels 360 kilometers in 4 hours. At this speed, how many hours will it take to complete the journey?
两城相距540千米，一辆汽车4小时行驶了360千米，照这样的速度，还要几个小时才能行完全程？
<gadget id="calculator">360 / 4</gadget>
<output>90</output>

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

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<result>2</result>