A, B, and C are walking at speeds of 300 m/min, 400 m/min, and 500 m/min, respectively. A and B are at A, and C is walking towards B at the same time. It is known that the distance between A and B is 11,900 meters. How many minutes later, C is exactly in the middle of A and B.
甲、乙、丙三人行走的速度分别是300米/分、400米/分和500米/分．甲乙在A地，丙在B地同时相向而行．已知A、B两地相距11900米，多少分钟后丙正好在甲、乙两人正中间．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">400 * (1/2)</gadget>
<output>200</output>

<gadget id="calculator">300 * (1/2)</gadget>
<output>150</output>

<gadget id="calculator">500 - 150</gadget>
<output>350</output>

<gadget id="calculator">300 + 200 + 350</gadget>
<output>850</output>

<gadget id="calculator">11_900 / 850</gadget>
<output>14</output>

<result>14</result>