A highway is 240 kilometers long, a bus takes 2.5 hours to complete the journey, and a truck takes 3.2 hours to complete the journey. How much more miles per hour does the passenger car travel than the truck?
一条高速公路长240千米，一辆客车2.5小时行完全程，一辆货车用3.2小时行完全程．客车每小时比货车多行多少千米？
<gadget id="calculator">240 / 2.5</gadget>
<output>96</output>

<gadget id="calculator">240 / 3.2</gadget>
<output>75</output>

<gadget id="calculator">96 - 75</gadget>
<output>21</output>

<result>21</result>