A and B set off from A and B at the same time and walk toward each other. A walks 100 meters per minute. After the two meet, B walks another 1000 meters to A, and A walks another 12 minutes to B. Ask for B's speed ．
甲、乙分别从A、B两地同时出发相向而行，甲每分走100米，两人相遇后，乙再走1000米来到A地，甲再走12分钟到B地，求乙速．
<gadget id="calculator">100 * 12</gadget>
<output>1_200</output>

<gadget id="calculator">1_000 / 100</gadget>
<output>10</output>

<gadget id="calculator">1_200 / 10</gadget>
<output>120</output>

<result>120</result>