A car travels 229.25 kilometers in 3.5 hours, and a car travels 328.5 kilometers in 4.5 hours. Which car travels faster? How many kilometers per hour?
一辆小汽车3.5小时行驶229.25千米，一辆小轿车4.5小时行驶328.5千米，哪种车行驶的速度快？每小时快多少千米？
<gadget id="calculator">328.5 / 4.5</gadget>
<output>73</output>

<gadget id="calculator">229.25 / 3.5</gadget>
<output>65.5</output>

<gadget id="calculator">73 - 65.5</gadget>
<output>7.5</output>

<result>7.5</result>