The two brothers went from home to the gymnasium at the same time, and the road was 1300 meters long. The elder brother walks 80 meters per minute, and the younger brother rides a bicycle at a speed of 180 meters per minute to the gymnasium and returns immediately. He meets his elder brother on the way. How many minutes has his elder brother walked?
兄弟两个人同时从家里到体育馆，路长1300米．哥哥每分步行80米，弟弟骑自行车以每分180米的速度到体育馆后立刻返回，途中与哥哥相遇，这时哥哥走了几分钟？
<gadget id="calculator">80 + 180</gadget>
<output>260</output>

<gadget id="calculator">2 / 260</gadget>
<output>1/130 = around 0.007692</output>

<gadget id="calculator">1_300 * (1/130)</gadget>
<output>10</output>

<result>10</result>