The distance between the two places is 550 kilometers, a passenger car travels 60 kilometers per hour, and a truck travels 50 kilometers per hour. If two cars drive opposite each other for 4.5 hours at the same time, how many meters are there between the two cars?
两地相距550千米，一列客车每小时行60千米，一列货车每小时行50千米．如果两车同时从两地相对开出4.5小时，两车还相距多少米？
<gadget id="calculator">60 + 50</gadget>
<output>110</output>

<gadget id="calculator">110 * 4.5</gadget>
<output>495</output>

<gadget id="calculator">550 - 495</gadget>
<output>55</output>

<result>55</result>