A car travels from A to B at 60 kilometers per hour. When it passes the midpoint of 120 kilometers, it is still 180 kilometers away from B. How many hours does it take for the car to reach B?
一辆汽车从甲地去乙地，每小时行60千米，当驶过中点120千米时，离乙地还有180千米，这辆汽车达到乙地一共用了多少小时？
<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>