A highway is 336 kilometers long, and it takes 3.5 hours for a passenger car to complete the journey; and 4.2 hours for a truck to complete the journey. How much faster are passenger cars than trucks?
一条高速公路长336千米，一辆客车3.5小时行完全程；一辆货车4.2小时行完全程．客车的速度比货车快多少？
<gadget id="calculator">336 / 3.5</gadget>
<output>96</output>

<gadget id="calculator">336 / 4.2</gadget>
<output>80</output>

<gadget id="calculator">96 - 80</gadget>
<output>16</output>

<result>16</result>