The express train and the slow train leave from A and B respectively at the same time. The speed of the slow train is 2/3 of the speed of the express train. The two trains meet each other after driving for 6 hours and continue to move forward. How many hours before the slow train arrives at the destination?
快车和慢车分别从A，B两地同时相向开出，慢车速度是快车速度的(2/3)，两车开出6小时相遇并继续前进，快车比慢车早几个小时到达目的地？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 + (2/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">1 / 6 / (5/3)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * (2/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

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

<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<result>5</result>