Two cars, fast and slow, are traveling towards each other at the same time from two places 480 kilometers apart. After 3 hours, they will still be separated by the whole distance. At this speed, how many hours will it take for the two cars to meet?
快、慢两车同时从相距480千米的两地相向而行，3小时后还相距全程的-，照这样的速度，两车还要经过几小时才能相遇？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">3 / (1/3)</gadget>
<output>9</output>

<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<result>6</result>