bus and a passenger car are driving from A to B at the same time. The bus travels 50 kilometers per hour, and the passenger car travels 45 kilometers per hour. Now the bus arrives half an hour earlier than the passenger car. What is the distance between A and B? km?
一辆公交车和一辆客车同时从甲地开往乙地，公交车每小时行50千米，客车每小时行45千米，现在公交车比客车早半小时到达，问甲乙两地相距多少千米？
<gadget id="calculator">50 - 45</gadget>
<output>5</output>

<gadget id="calculator">0.5 / 5</gadget>
<output>0.1</output>

<gadget id="calculator">45 * 0.1 * 50</gadget>
<output>225</output>

<result>225</result>