Wang Xin and Lu Liang are walking towards each other from two places 2000m apart at the same time. Wang Xin’s speed is 110m/min, and Lu Liang’s speed is 90m/min. Walking in the same direction, when you meet Lu Liang, you immediately turn your head and run to Wang Xin, and run to Lu Liang again when you meet Wang Xin. This kept going back and forth until Wang Xin and Lu Liang met, how many m did the dog walk together?
王欣和陆亮两人同时从相距2000m的两地相向而行，王欣的速度为110m/min，陆亮的速度为90m/min，如果一只狗以500m/min的速度与王欣同时同向而行，遇到陆亮后，立即回头向王欣跑去，遇到王欣再向陆亮跑去．这样不断来回，直到王欣和陆亮相遇为止，狗共行了多少m？
<gadget id="calculator">110 + 90</gadget>
<output>200</output>

<gadget id="calculator">2_000 / 200</gadget>
<output>10</output>

<gadget id="calculator">10 * 500</gadget>
<output>5_000</output>

<result>5_000</result>