Two passengers travel towards each other from the east and west towns at the same time. The distance between the east and west towns is 20 kilometers. A travels 120 meters per minute, and B travels 80 meters per minute. After walking for a while, ask the two to meet at how many meters away from the midpoint?
两旅客分别从东西两镇同时相向而行，东西两镇相距20千米，甲每分钟行120米，乙每分钟行80米．行了一段时间后，求两人在距中点多少米处相遇？
<gadget id="calculator">1_000 / 2</gadget>
<output>500</output>

<gadget id="calculator">20 * 500</gadget>
<output>10_000</output>

<gadget id="calculator">120 + 80</gadget>
<output>200</output>

<gadget id="calculator">1_000 / 200</gadget>
<output>5</output>

<gadget id="calculator">80 * 20 * 5</gadget>
<output>8_000</output>

<gadget id="calculator">10_000 - 8_000</gadget>
<output>2_000</output>

<result>2_000</result>