The distance between the two places is 1,200 kilometers. Car A completes the journey in 15 hours, and train B completes the journey in 10 hours. The two trains run towards each other from the two places at the same time. After how many hours, the two trains meet?
两地相距1200千米，甲车15小时行完全程，乙车10小时行完全程，两列火车同时分别从两地相向而行，经过几小时两车相遇？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/15) + (1/10)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / (1/6)</gadget>
<output>6</output>

<result>6</result>