A highway is 324 kilometers long, and it takes 4.5 hours for a passenger car to complete the journey, and 4.8 hours for a truck to complete the journey. How much faster is the passenger car than the truck?
一条高速公路长324千米，一辆客车4.5小时行完全程，一辆货车4.8小时行完全程．客车的速度比货车的速度快多少？
<gadget id="calculator">324 / 4.5</gadget>
<output>72</output>

<gadget id="calculator">324 / 4.8</gadget>
<output>67.5</output>

<gadget id="calculator">72 - 67.5</gadget>
<output>4.5</output>

<result>4.5</result>