A and B go from A to B at the same time. A travels 50 meters per minute, B travels 80 meters per minute. When B arrives at B, he returns immediately and meets A. When they met, B traveled a total of 800 meters. Think about it, how many meters are there between A and B?
甲、乙两人同时从A地去B地，甲每分钟行50米，乙每分钟行80米，乙到达B地后立即返回，并与甲相遇，相遇时，乙一共行了800米，想一想，A、B两地相距多少米？
<gadget id="calculator">800 / 80</gadget>
<output>10</output>

<gadget id="calculator">50 * 10</gadget>
<output>500</output>

<gadget id="calculator">500 + 800</gadget>
<output>1_300</output>

<gadget id="calculator">1_300 / 2</gadget>
<output>650</output>

<result>650</result>