Students from the primary school in the new district went to plant trees. They planted 316 trees in the morning and 252 trees in 3 hours in the afternoon. How many trees were planted per hour on average in the afternoon?
新区小学的同学去栽树，上午栽了316棵，下午3小时栽了252棵．下午平均每小时栽了多少棵？
<gadget id="calculator">252 / 3</gadget>
<output>84</output>

<result>84</result>