Two trains, A and B, leave opposite directions from two cities 300 kilometers apart. The speed ratio between A and B is 5:6. It is known that it takes 12 hours for train A to complete the journey, and it takes 12 hours for train B to complete the journey. how many hours? (Answer with proportional knowledge)
甲，乙两列火车从相距300千米的两城相向开出，甲，乙两车速度比是5：6，已知甲列火车行完全程需要需要12小时，乙列火车行完全程需要多少小时？(用比例知识解答)
<gadget id="calculator">300 / 12</gadget>
<output>25</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">25 / (5/6)</gadget>
<output>30</output>

<gadget id="calculator">300 / 30</gadget>
<output>10</output>

<result>10</result>