A car drives from A to B at 60 kilometers per hour. When it exceeds 120 kilometers from the midpoint, it is still 180 kilometers away from the end point. How many hours does it take for this car to reach B?
汽车从甲地开往乙地，每小时行60千米，当超过中点120千米时，离终点还有180千米，这辆汽车共需几小时能达到乙地？
<gadget id="calculator">120 + 180</gadget>
<output>300</output>

<gadget id="calculator">2 / 60</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">300 * (1/30)</gadget>
<output>10</output>

<result>10</result>