A rice milling machine mills 200 kilograms of rice in 4 hours. According to this calculation, how many hours will it take to mill 2500 kilograms of rice.
一台碾米机4小时碾米200千克，照这样计算，要碾米2500千克，要多少小时．
<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<gadget id="calculator">2_500 / 50</gadget>
<output>50</output>

<result>50</result>