worker started making lanterns at 8:50 in the morning and made a total of 400 lanterns at 1:50 in the afternoon. How many lanterns does this worker make on average per hour?
一名工人从上午8：50开始做彩灯，到下午1：50共做了400盏．这名工人平均每时做多少盏彩灯？
<gadget id="calculator">400 / 5</gadget>
<output>80</output>

<result>80</result>