Class 3 and Class 2 participated in tree planting, starting at 7:15 am and ending at 10:15 am. If they planted 8 trees per hour on average, how many trees did they plant in total?
三2班同学参加植树，从早上7：15开始，10：15结束，如果平均每小时植树8棵，他们一共植树多少棵？
<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<result>24</result>