Two cars, A and B, travel from A to B. A travels 60 kilometers per hour, and B travels 80 kilometers per hour. Two hours after A set off, B starts to chase A along the route of A, how many hours can he catch up?
甲、乙两车从A地块往B地，甲每小时行60千米，乙每小时行80千米．甲出发2小时后，乙沿着甲的路线行驶开始追甲，几小时后能追上？
<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">60 * (1/10)</gadget>
<output>6</output>

<result>6</result>