A truck travels 302.4 kilometers in 3.6 hours, and a passenger car travels the same distance in 4.8 hours. How much faster is the speed of the truck than the speed of the passenger car?
一辆货车3.6小时行驶302.4千米，一辆客车4.8小时也行驶了同样的路程，货车的速度比客车的速度快多少？
<gadget id="calculator">302.4 / 3.6</gadget>
<output>84</output>

<gadget id="calculator">302.4 / 4.8</gadget>
<output>63</output>

<gadget id="calculator">84 - 63</gadget>
<output>21</output>

<result>21</result>