A highway is 504 kilometers long, and it takes 4.8 hours for a passenger car to complete the journey, and 6 hours for a truck to complete the journey. How much faster is the passenger car than the truck?
一条高速路长504千米，一辆客车4.8小时行完全程，一辆货车用6小时行完全程．客车的速度比货车的速度快多少？
<gadget id="calculator">504 / 4.8</gadget>
<output>105</output>

<gadget id="calculator">504 / 6</gadget>
<output>84</output>

<gadget id="calculator">105 - 84</gadget>
<output>21</output>

<result>21</result>