The school leveled the playground, and 35 people leveled 1260 square meters in 3 hours. According to this calculation, how many hours will it take for 40 people to level 2880 square meters.
学校平整操场，35人3小时平整1260平方米，照这样算，40人平整2880平方米，要多少小时．
<gadget id="calculator">1_260 / 3 / 35</gadget>
<output>12</output>

<gadget id="calculator">2_880 / 40 / 12</gadget>
<output>6</output>

<result>6</result>