A train of passenger cars travels 216 kilometers in 4 hours, and a train of trucks travels 240 kilometers in 4 hours. By how many kilometers does the passenger car travel less per hour than the truck?
一列客车4小时行216千米，一列货车4小时行240千米，客车每小时比货车少行多少千米？
<gadget id="calculator">240 / 4</gadget>
<output>60</output>

<gadget id="calculator">216 / 4</gadget>
<output>54</output>

<gadget id="calculator">60 - 54</gadget>
<output>6</output>

<result>6</result>