Practice: Two cars, A and B, drive in opposite directions at the same time. Car A travels 40 kilometers per hour, and car B travels 5.5 kilometers per hour. After 4 hours, how many kilometers are the distance between the two cars?
练一练：甲乙两车同时同地相反方向开出，甲车每小时行40千米，乙车乙车每小时快5.5千米．4小时后，两车相距多少千米？
<gadget id="calculator">40 + 40 + 5.5</gadget>
<output>85.5</output>

<gadget id="calculator">85.5 * 4</gadget>
<output>342</output>

<result>342</result>