Two cars, A and B, drive from A to B at a distance of 450 km at the same time. Car A travels 50 km per hour, and Car B travels 45 km per hour. After A arrives at B, how long will it take for B to reach B? (solution by equation)
甲、乙两车同时从相距450km的A地开往B地，甲车每小时行50km，乙车每小时行45km，甲车到达B地后，乙车还需要多长时间才能到达B地？(用方程解)
<gadget id="calculator">450 / 50</gadget>
<output>9</output>

<gadget id="calculator">45 * 9</gadget>
<output>405</output>

<gadget id="calculator">450 - 405</gadget>
<output>45</output>

<gadget id="calculator">45 / 45</gadget>
<output>1</output>

<result>1</result>