Car A travels 50 kilometers per hour, and car B travels 60 kilometers per hour. Two cars set off from A and B at the same time and drive toward each other. Car A arrives at B 3 hours after meeting. How many kilometers are there between A and B?
甲车每小时行50千米，乙车每小时行60千米．两车分别从A、B两地同时出发，相向而行，相遇后3小时甲车到达B地，A、B两地相距多少千米？
<gadget id="calculator">50 + 60</gadget>
<output>110</output>

<gadget id="calculator">3 / 60</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">50 * (1/20)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">110 * (5/2)</gadget>
<output>275</output>

<result>275</result>