There are 500 kilograms of cabbage, 230 kilograms are sold in the morning, and the rest will be sold within 3 hours. How many kilograms are sold per hour on average?
有500千克的白菜，上午卖出230千克，剩下的要在3小时之内卖出，平均每小时卖多少千克？
<gadget id="calculator">500 - 230</gadget>
<output>270</output>

<gadget id="calculator">270 / 3</gadget>
<output>90</output>

<result>90</result>