It takes 6 hours for an express train to travel from station A to station B, and 9 hours for a slow train to travel from station B to station A. The express train leaves for 2 hours before the slow train leaves. It is known that the slow train travels 36 kilometers per hour. When the slow train leaves, How many hours later will the two cars meet?
一列快车从甲站到乙站需6小时，一列慢车从乙站到甲站需9小时，快车先开出2小时，慢车才出发，已知慢车每小时行36千米，当慢车出发后，再经过几小时两车相遇？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/6) + (1/9)</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">(2/3) / (5/18)</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>