Xiao Ming and Xiao Hua set off from their schools at the same time to participate in exchange activities at each other's schools. 20 minutes later, they met at a distance of 800 meters from Xiaoming's school. When they finished participating in the 2-hour activity (the activity just started when they arrived at the school), they returned immediately and met again at a distance of 400 meters from Xiaohua's school. What is the distance between the two schools in meters?
小明、小华分别从他们所在的学校同时出发去对方的学校参加交流活动．20分钟后在距小明的学校800米处相遇．当他们参加完2小时的活动后(他们到达学校时活动恰好开始)，立即返回，在离小华学校400米处又一次相遇，这两所学校间的距离是多少米．
<gadget id="calculator">800 * 3</gadget>
<output>2_400</output>

<gadget id="calculator">2_400 - 400</gadget>
<output>2_000</output>

<result>2_000</result>